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 cau
vai cac » va cac, tai cac, voi cac
vai cau » va cau, van cau, lai chau
so sach » so sanh, bo sach, co sach
thi van » thi lan, thi hanh, thi nang
nang xa » nang x, lang xa, nang ma
cam tuc » cam xuc, cam tu, nam thuc
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (thu sach)) ky nang xa hoi. thi van cam tuc va thanh ((vai cau) OR (vai cac)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (thu sach)) ky nang xa hoi. thi van cam tuc va thanh ((vai cau) OR (vai cac)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (thu sach)) ky nang xa hoi. thi van cam tuc va thanh ((vai cau) OR (vai cac)) tren".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (thu sach)) ky nang xa hoi. thi van cam tuc va thanh ((vai cau) OR (vai cac)) tren*.