Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hang » ngan hang
vai cua » dai cua, hai cua, lai cua
te sach » toc sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, may nang
cac bo » bac bo, cac co
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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 ((y nang) OR (v nang)) x hoi. hieu ve cac bo ((ban hanh) OR (ban hang)) vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (v nang)) x hoi. hieu ve cac bo ((ban hanh) or (ban hang)) vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (v nang)) x hoi. hieu ve cac bo ((ban hanh) or (ban hang)) vai cua triet*.