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

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 ve) or (hieu van)) 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 ve) OR (hieu van)) 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 ve) or (hieu van)) cac quoc ban anh ve ((cua tre) OR (cuu tre))*".