Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
cham duc » cham soc, pham duy, phan duc
vu sach » vu bach, su sach, vu khach
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach tu nang xa hoi. hieu va ((cham duc) or (pham duc)) ((ban thanh) or (ban hanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tu nang xa hoi. hieu va ((cham duc) OR (pham duc)) ((ban thanh) OR (ban hanh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach tu nang xa hoi. hieu va ((cham duc) or (pham duc)) ((ban thanh) or (ban hanh)) hai cua tre*.