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