Yes, You can. There is a misconception that vegetarians or vegans can't get enough protein from food. Of course, you can. You have to put a little effort into combining two or more ingredients to make the amino acid profile complete. For example- 100grams of Soy chunks have more than 50grams of protein. A combination of two scoops of peanut butter and two slices of whole wheat bread gives you 10 grams of protein. So, you have to do your research to find the food you like and use them to complete your protein requirements.