Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
chat hoc » chat hoa, chat thom, cho hoc
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu cac, tu san
va dau » va dao
sac ky » cac ky, sai ky
va dan » ca dan, va dao, va dap

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 lang xa hoi. hieu va chat hoc ((va dan) OR (va dau)) 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 va chat hoc ((va dan) OR (va dau)) vi ((cuu tre) or (cau theo))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang xa hoi. hieu va chat hoc ((va dan) OR (va dau)) vi ((cuu tre) or (cau theo))*.