Perhaps you should try some spelling variations:
cuoc luc » coc luc, duoc lac, duoc luu
binh voi » binh hoi, minh voi, tinh voi
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. ((hieu ve) OR (hieu va)) cuoc luc va ((tinh vi) or (binh voi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. ((hieu ve) OR (hieu va)) cuoc luc va ((tinh vi) OR (binh voi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. ((hieu ve) OR (hieu va)) cuoc luc va ((tinh vi) or (binh voi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. ((hieu ve) OR (hieu va)) cuoc luc va ((tinh vi) or (binh voi)) cua tre*.