Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
pham thuc » phap thuc, pham chuc, nham thuc
hieu voi » hieu moi, lieu voi, hieu loi
hanh vai » hanh vi, hanh va, hanh tai
hieu vi » hieu va, hieu ve, hien vi
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((sach ty) or (sach y)) nang xa hoi. ((hieu vi) OR (hieu voi)) pham thuc va hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ty) OR (sach y)) nang xa hoi. ((hieu vi) OR (hieu voi)) pham thuc va hanh vai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((sach ty) or (sach y)) nang xa hoi. ((hieu vi) OR (hieu voi)) pham thuc va hanh vai cua triet*".