Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
quoc bao » quoc oai, hoc bao, quoc va
quoc lan » quoc ban, nuoc luan, quoc quan
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
cua tre » cuu tre, cua triet, dua tren
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua te » cua tu

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 sac ky mang may hoi. hieu van cham ((quoc bao) OR (quoc lan)) hanh vi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky mang may hoi. hieu van cham ((quoc bao) or (quoc lan)) hanh vi ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky mang may hoi. hieu van cham ((quoc bao) or (quoc lan)) hanh vi ((cua tre) OR (cua te))*.