Perhaps you should try some spelling variations:
quoc bao » quoc oai, quoc va
cuu tre » cau tren, cau treo
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
cua tre » cua te, cua triet, dua tren
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
xanh di » danh di, vanh dai, xanh tai
hoc bao » hoc cao, hoc bai, hoc bo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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 dang ma hoi. hieu ve cham ((quoc bao) OR (hoc bao)) xanh di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang ma hoi. hieu ve cham ((quoc bao) OR (hoc bao)) xanh di ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang ma hoi. hieu ve cham ((quoc bao) OR (hoc bao)) xanh di ((cua tre) or (cuu tre))*".