Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
cuc tre » duc tre, cua tre, cuu tre

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 nang cao hoc. ((hieu ve) or (hieu van)) cam duc ban thanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cao hoc. ((hieu ve) OR (hieu van)) cam duc ban thanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cao hoc. ((hieu ve) or (hieu van)) cam duc ban thanh tai cuc tre*.