Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu nang » thi nang, thu bang, tho nang
hanh tai » thanh tai, hang tai, han tai
thu hang » thi hang, thuc hanh, thu huong
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
v pham » vi pham, d pham
hieu v » hieu va, hieu ve, hieu 2
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 sach ((thu nang) or (thu hang)) cao hoi. hieu v pham thuc va hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thu nang) OR (thu hang)) cao hoi. hieu v pham thuc va hanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ((thu nang) or (thu hang)) cao hoi. hieu v pham thuc va hanh tai cua te*.