Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
cam duc » cao duc, pham duc, nam duoc
van cau » van dau, van hau, van chat
tu sach » thu sach, su sach, te sach
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang

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 sach ((ky lang) OR (ky dang)) xa hoi. hieu van ((cam duc) OR (cam xuc)) ban thanh van cau triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky dang)) xa hoi. hieu van ((cam duc) or (cam xuc)) ban thanh van cau triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky dang)) xa hoi. hieu van ((cam duc) or (cam xuc)) ban thanh van cau triet*.