Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vai cua » dai cua, hai cua, lai cua
duc ban » duc tan, duc van, dua ban
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
van cac » van hac, van bac, dan cac
cao hoi » cau hoi, co hoi, cao hoc
tu nang » tru nang, tu nong, tu nano
van cau » van dau, van hau, van chat
vi cua » di cua

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 tu nang cao hoi. hieu ((van cac) or (van cau)) duc ban thanh ((vi cua) or (vai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang cao hoi. hieu ((van cac) OR (van cau)) duc ban thanh ((vi cua) OR (vai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: su sach tu nang cao hoi. hieu ((van cac) or (van cau)) duc ban thanh ((vi cua) or (vai cua)) viet*.