Please suggest some.low carbohydrates vegetarian dinner recipes

You can find low carb recipes on Allrecipes.com. https://www.allrecipes.com/search?q=low+carb

You'll have to scroll through to find the vegetarian ones. or use the filters to select Vegetarian, and sort through to find the low carb ones.

https://www.allrecipes.com/recipes/87/everyday-cooking/vegetarian/

Skinnytaste.com also has low carb and/or vegetarian recipes. You'll have to search for them.

https://www.skinnytaste.com/recipes/vegetarian/

You can also search the internet for low carb vegetarian recipes and find multiple sites with recipes.