Perhaps you should try some spelling variations:
ban thanh » ban hang
van cham » van chat, van tham, va cham
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
cham duc » pham duc, cham soc, pham duy
ky tang » ky nang, kho tang, ky trong
hai cua » thai cua, dai cua, hoi cua
ky dang » ky nang, ky danh
su sac » su sach, su cac, su xac
cua te » cua tu

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