Perhaps you should try some spelling variations:
ban thanh » ban hang
nam duoc » nam thuoc, da duoc, dat duoc
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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