Perhaps you should try some spelling variations:
ban hang » ngan hang
cham duc » pham duc, cham soc, pham duy
vu sach » vu bach, su sach, vu khach
hai cua » thai cua, dai cua, hoi cua
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
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 hoi. hieu va cham duc ((((ban thanh) OR (ban hang))) or (ban hanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang xa hoi. hieu va cham duc ((((ban thanh) OR (ban hang))) OR (ban hanh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang xa hoi. hieu va cham duc ((((ban thanh) OR (ban hang))) or (ban hanh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang xa hoi. hieu va cham duc ((((ban thanh) OR (ban hang))) or (ban hanh)) hai cua tre*.