Perhaps you should try some spelling variations:
hanh sinh » hanh tinh, hanh dinh, hinh sinh
sinh cua » manh cua, dinh cuu, sinh va
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky tang xa hoi. ((hieu ve) or (hieu va)) co hoc va hanh sinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky tang xa hoi. ((hieu ve) OR (hieu va)) co hoc va hanh sinh cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky tang xa hoi. ((hieu ve) or (hieu va)) co hoc va hanh sinh cua tre*.