Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hai chau » lai chau, ha chau, hat chau
tang hoi » tang ho, tang loi, tan hoi
sach ky » sac ky, sach y, sach ty
hai cau » hai chu, hai hau, hoi cau
su sach » so sach, vu sach
cac xuc » cam xuc, cac nuoc, chat xuc
qua cac » cua cac
hoi hoc » hoa hoc, khoa hoc, hoi chuc
ky tang » ky nang, ky dang, kho tang
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: su sach ky tang hoi hoc. hieu qua cac xuc ((va hanh) or (ban thanh)) ((hai cau) or (hai chau)) theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang hoi hoc. hieu qua cac xuc ((va hanh) OR (ban thanh)) ((hai cau) OR (hai chau)) theo.
• Adding a wildcard symbol may retrieve word variants: su sach ky tang hoi hoc. hieu qua cac xuc ((va hanh) or (ban thanh)) ((hai cau) or (hai chau)) theo*.