Perhaps you should try some spelling variations:
cac quoc » cac nuoc, cac cuoc, cao quoc
quoc ban » quoc bao, quoc lan, quoc quan
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
ban anh » ban hanh, ban banh, ban danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
anh ve » hanh ve, anh va, anh viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky nang xa hoi. ((hieu va) or (lieu va)) cac quoc ban anh ve ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang xa hoi. ((hieu va) OR (lieu va)) cac quoc ban anh ve ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky nang xa hoi. ((hieu va) or (lieu va)) cac quoc ban anh ve ((cua tre) OR (cuu tre))*".