Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tang hoi » tang ho, tang loi, tan hoi
va hanh » van hanh, va thanh, va danh
hai hau » hai chau, dai hau, hai hai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
hoi hoc » hoa hoc, khoa hoc, hoi chuc
ky tang » ky nang, ky dang, kho tang

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 va cac xuc ((va hanh) or (ban thanh)) ((hai hau) or (lai chau)) theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang hoi hoc. hieu va cac xuc ((va hanh) OR (ban thanh)) ((hai hau) OR (lai chau)) theo.
• Adding a wildcard symbol may retrieve word variants: su sach ky tang hoi hoc. hieu va cac xuc ((va hanh) or (ban thanh)) ((hai hau) or (lai chau)) theo*.