Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
phap thuc » phap thu, phap hoc, phap tu
hieu voi » hieu moi, lieu voi, nhien voi
hanh vai » hanh vi, hanh va, hanh tai
hieu loi » hieu moi, hien loi, hieu luc
sach ky » sac ky, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa

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 ky) OR (sach y)) nang ma hoi. ((hieu voi) or (hieu loi)) phap thuc va hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ky) OR (sach y)) nang ma hoi. ((hieu voi) OR (hieu loi)) phap thuc va hanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((sach ky) OR (sach y)) nang ma hoi. ((hieu voi) or (hieu loi)) phap thuc va hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: doc ((sach ky) OR (sach y)) nang ma hoi. ((hieu voi) or (hieu loi)) phap thuc va hanh vai cua triet*.