Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tan hanh » tan thanh, tang hanh, toan hanh
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
cam duc » cam xuc, cao duc, nam duoc
cua tre » cuu tre, cua triet, dua tren
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
cua te » cua tu

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 duc) or (pham duc)) tan hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky tang xa hoi. hieu van ((cam duc) OR (pham duc)) tan hanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu san ky tang xa hoi. hieu van ((cam duc) or (pham duc)) tan hanh vi ((cua tre) or (cua te))*.