Perhaps you should try some spelling variations:
nganh nong » nganh cong
dan thuc » dan toc, am thuc
nong hoc » dong hoc, nang hoc, nong thon
van nhan » van phan, van thanh, danh nhan
nhan van » nhan dan, nhan va, phan van
hai van » thai van, ha van, hai tan
tu dan » tuc dan, tu ban, cu dan
ma hai » ta hai, va hai, xa hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan thuc vat, nghien cuu ((van hoc) or (van hoa)) nganh nong hoc ma hai van nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan thuc vat, nghien cuu ((van hoc) OR (van hoa)) nganh nong hoc ma hai van nhan van.
• Adding a wildcard symbol may retrieve word variants: tu dan thuc vat, nghien cuu ((van hoc) or (van hoa)) nganh nong hoc ma hai van nhan van*.