Perhaps you should try some spelling variations:
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu van
va daoh » va danh, va doanh
va dao » ca dao
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
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 xa hoi. ((hieu ve) or (hieu va)) cam duc ((va daoh) or (va dao)) dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang xa hoi. ((hieu ve) OR (hieu va)) cam duc ((va daoh) OR (va dao)) dai cua te.
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. ((hieu ve) or (hieu va)) cam duc ((va daoh) or (va dao)) dai cua te*.