Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
luc va » duc va, tuc va, loc va

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

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