Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thu van » thuc van, thuy van, tu van
cuu tre » cua tre, cau tren, cau treo
tu ban » thu ban, te ban
vi cuu » vi luu, vinh cuu

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) or (tu ban)) ky nang xa hoi. ((hieu van) or (hieu va)) nam thu van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (tu ban)) ky nang xa hoi. ((hieu van) OR (hieu va)) nam thu van hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (tu ban)) ky nang xa hoi. ((hieu van) or (hieu va)) nam thu van hanh vi cuu tre*.