Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
vai cua » dai cua, hai cua, lai cua
so sach » so sanh, bo sach, co sach
sach lo » sach dao, sach doi, sach hoi
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
lo nang » ho nang, ly nang, loai nang
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 lo nang xa hoi. hieu 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 lo nang xa hoi. hieu va cam tuc ((ban thanh) OR (ban hang)) ((vi cua) OR (vai cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach lo nang xa hoi. hieu va cam tuc ((ban thanh) or (ban hang)) ((vi cua) OR (vai cua)) viet".
• Adding a wildcard symbol may retrieve word variants: so sach lo nang xa hoi. hieu va cam tuc ((ban thanh) or (ban hang)) ((vi cua) OR (vai cua)) viet*.