Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
bang cau » hang cau, bang cac, nang cao
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
hieu ve » hieu van
tu bang » thu bang, tu ban, te bang
bo sach » co sach, hoc sach
tuc va » thuc va, truc va, tuc xa
lai va » loai va, mai va, dai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (bo sach)) tu bang cau hoi. ((hieu ve) OR (hieu va)) cam tuc va hanh lai va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (bo sach)) tu bang cau hoi. ((hieu ve) OR (hieu va)) cam tuc va hanh lai va triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (bo sach)) tu bang cau hoi. ((hieu ve) OR (hieu va)) cam tuc va hanh lai va triet*.