Perhaps you should try some spelling variations:
ban xanh » ban hanh, ban anh, ban banh
quoc ban » quoc bao, quoc lan, quoc quan
cua tre » cua te, cuu tre, cua triet
xanh de » hanh de, xanh di, thanh de
ve chat » va chat, van chat
ve cham » va cham, vu cham, ve chim
mai hoi » mai khoi, dai hoi, lai hoi
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
de cua » le cua, te cua, dieu 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 nang ((ma hoi) or (mai hoi)). hieu ((ve cham) OR (ve chat)) quoc ban xanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((ma hoi) OR (mai hoi)). hieu ((ve cham) OR (ve chat)) quoc ban xanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((ma hoi) or (mai hoi)). hieu ((ve cham) OR (ve chat)) quoc ban xanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) or (mai hoi)). hieu ((ve cham) OR (ve chat)) quoc ban xanh de cua tre*.