Perhaps you should try some spelling variations:
vua chua » sua chua, cua chua, tua chua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
cac luc » cau luc, coc luc, cac nuoc
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
va chu » va che, va cau, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. hieu qua cac luc va dan ((va chu) or (vua chua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu qua cac luc va dan ((va chu) OR (vua chua)) viet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu qua cac luc va dan ((va chu) or (vua chua)) viet*.