Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
dang co » dong co, dung co, dang do
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
dan co » dan cho, danh co, dan ca
cua su » qua su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang xa hoi. ((hieu va) OR (hieu qua)) cac nuoc va ((dan co) OR (dang co)) cua su~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky nang xa hoi. ((hieu va) OR (hieu qua)) cac nuoc va ((dan co) or (dang co)) cua su~".
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang xa hoi. ((hieu va) OR (hieu qua)) cac nuoc va ((dan co) or (dang co)) cua su*.