Perhaps you should try some spelling variations:
quoc tuan » quoc quan, quoc toan, quoc quang
cau treo » cau theo, cau tren, cau triet
cac quoc » cac nuoc, cac cuoc, cao quoc
cuu tre » cua tre, cau tren
anh vai » anh va, anh bai, anh van
hieu ve » hieu va, hieu van
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
tu sac » tu sach, tu cac, tu san

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

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