Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, hieu ve
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
xuc ban » duc ban, quoc ban, xuat ban
cuc ban » cua ban, cac ban, cuu ban
tai cua » thai cua, tai cuc, tri cua
y nang » ky nang, ly nang, v nang

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: su sach y nang cao hoi. ((hieu van) OR (lieu va)) cam ((xuc ban) OR (cuc ban)) thanh tai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang cao hoi. ((hieu van) or (lieu va)) cam ((xuc ban) OR (cuc ban)) thanh tai cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoi. ((hieu van) or (lieu va)) cam ((xuc ban) OR (cuc ban)) thanh tai cua triet*.