Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
xuc va » duc va, tuc va, luc va
sinh » dinh, minh, kinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh ly nang xa hoi. ((hieu ve) or (hieu van)) cam xuc va thanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh ly nang xa hoi. ((hieu ve) OR (hieu van)) cam xuc va thanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh ly nang xa hoi. ((hieu ve) or (hieu van)) cam xuc va thanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: hoc sinh ly nang xa hoi. ((hieu ve) or (hieu van)) cam xuc va thanh vi ((cua tre) OR (cuu tre))*.