Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
duoc van » duoc va, duc van, duoc ban
lam duoc » nam duoc, luat duoc, lam thuoc
van lam » van nam
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
tai cua » thai cua, tai cuc, tri cua
ma hoi » mai hoi, ma hoa, me hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((ky sang) or (ky tang)) ((ma hoi) or (xa hoi)). hieu van lam duoc van thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky sang) OR (ky tang)) ((ma hoi) OR (xa hoi)). hieu van lam duoc van thanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky sang) or (ky tang)) ((ma hoi) or (xa hoi)). hieu van lam duoc van thanh tai cua te*.