Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
cham hoc » cham soc, chat hoc, cham hoi
cuu tre » cua tre, cau tren
han dau » hang dau, phan dau, van dau
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
va han » va phan, van han, va hanh
te sac » te cac, te san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) OR (te sach)) ky lang xa hoi. hieu vu cham hoc va han dau ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te sach)) ky lang xa hoi. hieu vu cham hoc va han dau ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te sach)) ky lang xa hoi. hieu vu cham hoc va han dau ((cuu tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te sach)) ky lang xa hoi. hieu vu cham hoc va han dau ((cuu tre) or (cau treo))*.