Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham hoc » cham soc, chat hoc, cham hoi
danh vi » hanh vi, danh di, danh va
cuu tre » cua tre, cau tren, cau treo
dinh vi » dinh ve, dinh viet, dinh tri
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
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 lang xa hoi. hieu van cham hoc va ((danh vi) OR (dinh vi)) ((cuu tre) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang xa hoi. hieu van cham hoc va ((danh vi) OR (dinh vi)) ((cuu tre) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky lang xa hoi. hieu van cham hoc va ((danh vi) OR (dinh vi)) ((cuu tre) or (cau theo))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang xa hoi. hieu van cham hoc va ((danh vi) OR (dinh vi)) ((cuu tre) or (cau theo))*.