Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
cach thuc » anh thuc
cong hoc » dong hoc, cong hoa, cong coc
hoc hang » hoc hanh, hoc bang, hoc tang
hang hoa » hang khoa, thanh hoa, hang va
nhan dan » phan dau, gian dan, nhan tai
cac thu » cac thoi
va nhan » van nhan, ca nhan, va phan
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((cach thuc) OR (cac thu)) vat, nghien cua cong hoc hang hoa hoc xa hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((cach thuc) OR (cac thu)) vat, nghien cua cong hoc hang hoa hoc xa hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: hoc ((cach thuc) OR (cac thu)) vat, nghien cua cong hoc hang hoa hoc xa hoi va nhan dan*.