Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
qua cham » qua cac, va cham, qua cua
sach ty » sach y, sach tu, sach thu
dua ban » dia ban, cua ban, qua ban
so sach » so sanh, bo sach, co sach
qua hai » qua hoat
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
vi cua » vai cua
di cua » dai cua, doi cua, de 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 ty nang xa hoi. hieu ((qua hai) or (qua cham)) dua ban thanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu ((qua hai) OR (qua cham)) dua ban thanh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu ((qua hai) or (qua cham)) dua ban thanh ((vi cua) or (di cua)) tre*.