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