Perhaps you should try some spelling variations:
cham hoc » chat hoc, cham hoi, cho hoc
cuu tre » cua tre, cau tren, cau treo
va danh » va dinh, va dan, va hanh
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
luu tre » luu tru, luy tre
danh du » danh dau, danh tu, dinh du
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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 tang xa hoi. hieu ve ((cham hoc) OR (cham soc)) va danh du ((luu tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky tang xa hoi. hieu ve ((cham hoc) OR (cham soc)) va danh du ((luu tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky tang xa hoi. hieu ve ((cham hoc) OR (cham soc)) va danh du ((luu tre) or (cuu tre))*.