Perhaps you should try some spelling variations:
hieu van » thien van, lieu va
hoc cac » hoc cao
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua

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

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