Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
van cam » van nam, van lam, van dam
vai cac » va cac, tai cac, voi cac
van cau » van dau, van hau, van chat
co sach » bo sach, cuon sach, hoc sach
thi van » thi lan, thi hanh, thi nang
cam tuc » cam xuc, cam tu, nam thuc
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) or (thu sach)) ky nang x hoi. thi van cam tuc va thanh ((van cau) or (vai cac)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (thu sach)) ky nang x hoi. thi van cam tuc va thanh ((van cau) OR (vai cac)) tren.
• Adding a wildcard symbol may retrieve word variants: ((co sach) or (thu sach)) ky nang x hoi. thi van cam tuc va thanh ((van cau) or (vai cac)) tren*.