Perhaps you should try some spelling variations:
cay phoi » cap phoi, tay hoi, cay cho
toan soc » toan hoc, toan quoc, toan ho
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
va toan » van toan, bai toan, tap toan
cua tre » cua te, cua triet, dua tren
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, gay thoi
ban ky » van ky, dan ky
soc va » hoc va, loc va, doc va
te ban » te bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ban ky dang ((xay hoi) OR (cay phoi)). lieu va toan soc va hanh vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ban ky dang ((xay hoi) OR (cay phoi)). lieu va toan soc va hanh vi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ban ky dang ((xay hoi) OR (cay phoi)). lieu va toan soc va hanh vi ((cuu tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te ban ky dang ((xay hoi) OR (cay phoi)). lieu va toan soc va hanh vi ((cuu tre) or (cua tre))*.