Perhaps you should try some spelling variations:
ban thanh » ban hang
cham dua » chay dua, cham giua, pham duc
ban hanh » ban hang
su sach » so sach, vu sach
san cua » sang cua, ban cua, dan cua
va cham » va chat, va tham
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
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 ((ty nang) or (ty hang)) xa hoi. hieu va cham dua ((ban thanh) or (ban hanh)) san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty hang)) xa hoi. hieu va cham dua ((ban thanh) OR (ban hanh)) san cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) or (ty hang)) xa hoi. hieu va cham dua ((ban thanh) or (ban hanh)) san cua tre*.