Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
toc sach » hoc sach, doc sach, thuoc sach
xay hoi » tay hoi, cay phoi, gay thoi
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
cao dan » cao dang, cao danh, ca dan
lai cua » dai cua, hai cua, lai chau
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang ((xay hoi) OR (xa hoi)). hieu va nam thuc ((cao dan) or (cac dan)) lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang ((xay hoi) OR (xa hoi)). hieu va nam thuc ((cao dan) OR (cac dan)) lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang ((xay hoi) OR (xa hoi)). hieu va nam thuc ((cao dan) or (cac dan)) lai cua triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang ((xay hoi) OR (xa hoi)). hieu va nam thuc ((cao dan) or (cac dan)) lai cua triet*.