Perhaps you should try some spelling variations:
cham quoc » chuan quoc, han quoc, cham soc
ban hanh » ban hang
quoc ban » quoc bao, quoc lan, quoc quan
cua tre » cua te, cuu tre, cua triet
hanh di » hanh vi, hanh de, hang di
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
ma hoi » xa hoi, ma hoa, me hoi
di cua » dai cua, doi cua, de cua
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) or (ky dang)) ((ma hoi) or (mai hoi)). hieu ve cham quoc ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky sang) OR (ky dang)) ((ma hoi) OR (mai hoi)). hieu ve cham quoc ban hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky sang) or (ky dang)) ((ma hoi) or (mai hoi)). hieu ve cham quoc ban hanh di cua tre*.