Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hoc cac » hoc cao
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
xuc van » duc van, luc van, xuc ban
cua tre » cuu tre, cua triet, dua tren
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: hoc cac ky nang xa hoi. ((hieu ve) or (hieu van)) cam xuc van hanh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc cac ky nang xa hoi. ((hieu ve) OR (hieu van)) cam xuc van hanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc cac ky nang xa hoi. ((hieu ve) or (hieu van)) cam xuc van hanh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: hoc cac ky nang xa hoi. ((hieu ve) or (hieu van)) cam xuc van hanh vi ((cua tre) OR (cua te))*.