Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
hieu van » thien van, lieu va, hieu ve
nam duoc » nam thuoc, da duoc, dat duoc
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
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 van) or (hieu va)) ((nam duoc) or (cam xuc)) ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang xa hoi. ((hieu van) OR (hieu va)) ((nam duoc) OR (cam xuc)) ban thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. ((hieu van) or (hieu va)) ((nam duoc) or (cam xuc)) ban thanh dai cua tre*.