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