Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
danh de » hanh de, dan de, dang de
va danh » va dinh, va dan, va hanh
cau hoc » cau hoi, cau hoa, cao hoc
van cau » van dau, van hau, van chat
v nang » va nang, vu nang, van nang
de cua » le cua, te cua, dieu cua

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: ((te sach) OR (toc sach)) ((v nang) OR (cam nang)) xa hoi. hieu van cau hoc va danh de cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((v nang) or (cam nang)) xa hoi. hieu van cau hoc va danh de cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((v nang) or (cam nang)) xa hoi. hieu van cau hoc va danh de cua triet*.