Perhaps you should try some spelling variations:
chuan quoc » han quoc, cua quoc, phan quoc
cham quoc » han quoc, cham soc, cua quoc
ban xanh » ban hanh, ban anh, ban banh
cua tre » cua te, cuu tre, cua triet
xanh di » danh di, vanh dai, xanh tai
hieu va » lieu va, hieu qua
hieu ve » hieu van
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
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 xa hoi. ((hieu ve) or (hieu va)) ((cham quoc) OR (chuan quoc)) ban xanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang xa hoi. ((hieu ve) OR (hieu va)) ((cham quoc) OR (chuan quoc)) ban xanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang xa hoi. ((hieu ve) or (hieu va)) ((cham quoc) OR (chuan quoc)) ban xanh di cua tre*".