How can I get more fruit and veg into my diet?

This is what I usually eat

Breakfast - oatmeal with a spoon of honey, cup of chamomile tea
Lunch - salami sandwich, a mandarin, cup of anise tea
Dinner - soup or rice and curry , cup of cinnamon tea
Snacks - mandarins, banana, if calories are left over then something sweet

Am I right in understanding from this that you usually eat the same thing every day? If you are worried about getting enough nutrients then you should really be willing to mix it up.

But anyway, here are some specific ideas of things you can add:
1. Do you like bell peppers? I do! Especially if I am not getting enough veggies, I'll just have half a bell pepper with my lunch, it adds tons of vitamin C and (if it's red) a solid dose of vitamin A, and a bit of fiber. Crunchy and flavorful!
2. Spinach. Many people like it raw as a salad base. I don't, so I just spritz it with a tiny tiny bit of olive oil and stir it around in a hot skillet until it's totally wilted / broken down. A little salt and pepper. Makes a good side with dinner.
3. You're eating fruit, good. You might want to mix it up to get some higher-fiber fruit than mandarins though, they're not terribly nutritious as a diet mainstay. Pears are full of fiber! At the ripe old age of 43, I've finally learned to buy my pears green and let them ripen on the counter to ensure getting good juicy and unbruised pears. Apples are always good.
4. It's the season for cruciferous veggies, so this is a good time to be buying broccoli, cauliflower, and brussels sprouts. These veggies get a bad rap because most people overcook them, and if you know you don't like them too bad I guess. But just a tip: try coating them with a bit of olive oil, lemon juice and mustard, then roasting them in a 400' oven. NICE. Toothsome. DELICIOUS.
5. I don't know what kind of curry you're eating. I like to make a curry vegetable stir fry of whatever's around (usually cauliflower, bell pepper, onion, a tomato, a little potato, maybe broccoli) with ginger, garam masala, cumin, coriander, etc.
6. Yeah, you can add some fruit to your oatmeal. Apples or bananas are the fruit of choice for many. Pre-cooked squash or pumpkin is also very nice and nutritious. Berries and peaches are out of season right now, but you can always add frozen ones to oatmeal, they're nice.
7. Sweet potatoes! Full of vitamin A and fiber, and not as high in calories as you'd think, assuming that your portion sizes are reasonable and you're not loading them with unnecessary calories in the form of butter, sugar, maple syrup or marshmallows (gack! people sure do like to ruin sweet potatoes!). Two good ways to eat them: cube them, toss with a tsp of olive oil, roast in a 375' oven for 40 minutes or so, turning once or twice; or shredded and stir-fried in a hot skillet with a tsp of olive oil, sliced green onions, garlic, and a bit of soy sauce or fish sauce. NOM! (Oh also, you can also make a nice soup with them and spinach and say, udon noodles, maybe some sausage if that's you're thing. BAM -- new soup for you.).
8. Your diary isn't open, but I notice you're rather young and I'll just make a suggestion based on what I often see from other young people on MFP: make sure you're eating enough. I'm not saying this is you, but anyone who thinks they don't have enough calories budgeted to eat vegetables is definitely not eating enough.