Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
cac xuc » cam xuc, cac nuoc, chat xuc
cuu tre » cua tre, cau tren, cau treo
tang xa » trang xa, tang ma, lang xa
xuc van » duc van, luc van, xuc ban
van cac » van hac, van cau, van bac
san ky » sang ky, van ky, ban ky
dan ky » van 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) OR (dan ky)) tang xa hoi. hieu van cac xuc van hanh vi ((cuu tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (dan ky)) tang xa hoi. hieu van cac xuc van hanh vi ((cuu tre) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (dan ky)) tang xa hoi. hieu van cac xuc van hanh vi ((cuu tre) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (dan ky)) tang xa hoi. hieu van cac xuc van hanh vi ((cuu tre) or (cua tu))*.