Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hieu ve » hieu van
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
sinh y » sinh ly
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

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