Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam qua » cau qua, cac qua, cay qua
qua ban » cua ban, qua quan
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach thu)) nang xa hoi. hieu va cam qua ban thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) nang xa hoi. hieu va cam qua ban thanh san cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) nang xa hoi. hieu va cam qua ban thanh san cua tre*.