Perhaps you should try some spelling variations:
ban thanh » ban hanh
sach doi » sach hoi, sach moi, sach dao
doi nang » dai nang, hoi nang, voi nang
ban hang » ngan hang
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
cam tuc » cam xuc, cam tu, nam thuc
vai cua » dai cua, hai cua, lai cua
va cam » va cham, va cac, va cao
vi cua » di cua

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 doi nang xa hoi. lieu va cam tuc ((ban thanh) or (ban hang)) ((vi cua) or (vai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach doi nang xa hoi. lieu va cam tuc ((ban thanh) OR (ban hang)) ((vi cua) OR (vai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: so sach doi nang xa hoi. lieu va cam tuc ((ban thanh) or (ban hang)) ((vi cua) or (vai cua)) viet*.