Perhaps you should try some spelling variations:
ban thanh » ban hang
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
vu sach » vu bach, su sach, vu khach
vai cua » dai cua, hai cua, lai cua
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet

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 ty ((nang xa) OR (nang x)) hoi. lieu va cham duc ((ban thanh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((nang xa) OR (nang x)) hoi. lieu va cham duc ((ban thanh) OR (ban hanh)) vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty ((nang xa) OR (nang x)) hoi. lieu va cham duc ((ban thanh) or (ban hanh)) vai cua tre*".