Perhaps you should try some spelling variations:
kho tang » cao tang
cham hoc » cham soc, chat hoc, cham hoi
cuu tre » cua tre, cau tren, cau treo
luu tre » luu tru, luy tre
xanh di » danh di, vanh dai, xanh tai
va xanh » va danh, va hanh, va anh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, ky trong
ma hoi » mai hoi, xa hoi, ma hoa
tu sac » tu sach, tu cac, tu san

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