Perhaps you should try some spelling variations:
ban hang » ngan hang
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
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: te sach y ((nang ma) or (tang ma)) hoi. hieu va cam tuc ((ban hang) or (gia thanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (tang ma)) hoi. hieu va cam tuc ((ban hang) OR (gia thanh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) or (tang ma)) hoi. hieu va cam tuc ((ban hang) or (gia thanh)) hai cua tre*.