Perhaps you should try some spelling variations:
ban thanh » ban hang
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van cam » van nam, van lam, van cau
hai cua » thai cua, dai cua, hoi cua
su sach » so sach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
vu sach » vu bach, vu khach
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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)) ky tang ma hoi. hieu van cam xuc ((ban thanh) OR (ban hanh)) hai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky tang ma hoi. hieu van cam xuc ((ban thanh) OR (ban hanh)) hai cua tu~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky tang ma hoi. hieu van cam xuc ((ban thanh) OR (ban hanh)) hai cua tu*.