Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
su sach » so sach, vu sach
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
cam dua » ca dua, cay dua, chay dua
sach ty » sach y, sach tu, sach thu
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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 xa hoi. ((hieu va) or (lieu va)) cam dua ((ban thanh) or (ban hang)) san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu va) OR (lieu va)) cam dua ((ban thanh) OR (ban hang)) san cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu va) or (lieu va)) cam dua ((ban thanh) or (ban hang)) san cua tre*.