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

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 pham thuc va hanh vai ((cua triet) OR (su 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 pham thuc va hanh vai ((cua triet) OR (su 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 pham thuc va hanh vai ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: doc ((sach ty) or (sach y)) nang xa hoi. hieu vi pham thuc va hanh vai ((cua triet) OR (su triet))*.