Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
su sach » so sach
doi cua » dai cua, hoi cua
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
v nang » va nang, vu nang, van nang
cua tu » cua tuc, cua su, cua cu
va am » va lam, va cam

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) v nang xa hoi. hieu va am thuc ((ban thanh) OR (ban hang)) doi cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) v nang xa hoi. hieu va am thuc ((ban thanh) OR (ban hang)) doi cua tu~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) v nang xa hoi. hieu va am thuc ((ban thanh) OR (ban hang)) doi cua tu*.