Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
hai cua » thai cua, dai cua, hoi cua
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va
duc ban » duc tan, duc van, dua ban
su sac » su sach, su xac
cua tu » cua tuc, cua su, cua cu
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) OR (su cac)) ky tang xa hoi. ((hieu ve) or (hieu van)) pham duc ban thanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su cac)) ky tang xa hoi. ((hieu ve) OR (hieu van)) pham duc ban thanh hai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su cac)) ky tang xa hoi. ((hieu ve) or (hieu van)) pham duc ban thanh hai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su cac)) ky tang xa hoi. ((hieu ve) or (hieu van)) pham duc ban thanh hai cua tu*.