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 cac » van hac, van cau, van bac
xuc van » duc van, xuc ban, thuc van
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
cua tu » cua tuc, cua su, cua cu

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