Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va nang » van nang, da nang, cam nang
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang xa hoi. hieu va nang luc ((van hanh) OR (ban hanh)) de ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang xa hoi. hieu va nang luc ((van hanh) or (ban hanh)) de ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang xa hoi. hieu va nang luc ((van hanh) or (ban hanh)) de ((cua tre) OR (cuu tre))*.