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
cac luc » cau luc, cac nuoc, cac cuoc
va chua » ca chua, va chu, a chua
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau

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) OR (coc luc)) va dan ((va chua) 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) OR (coc luc)) va dan ((va chua) OR (vua chua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu qua ((cac luc) OR (coc luc)) va dan ((va chua) or (vua chua)) viet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu qua ((cac luc) OR (coc luc)) va dan ((va chua) or (vua chua)) viet*.