Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu nang » thi nang, thu hang, thu bang
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
sanh thu » sach thu, san thu, doanh thu
so sanh » do sanh
thuc va » thuc vat, thuc dan, thuc day
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh thu nang ((cao hoi) OR (cao hoc)). hieu ve pham thuc va ((hanh lai) or (hanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh thu nang ((cao hoi) OR (cao hoc)). hieu ve pham thuc va ((hanh lai) OR (hanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh thu nang ((cao hoi) OR (cao hoc)). hieu ve pham thuc va ((hanh lai) or (hanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: so sanh thu nang ((cao hoi) OR (cao hoc)). hieu ve pham thuc va ((hanh lai) or (hanh tai)) cua te*.