Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cua triet » cua viet, su triet, va triet
loai hoc » logic hoc, loai khoa, dai hoc
lai hoa » dai hoa
hieu ve » hieu va, hieu van
tai cua » thai cua, tai cuc, tri cua
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
ve cam » ve cham, ve cac, va cam
luc va » tuc va, loc va

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 xac ky nang ((lai hoa) OR (loai hoc)). hieu ve cam ((luc va) OR (duc va)) thanh tai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang ((lai hoa) OR (loai hoc)). hieu ve cam ((luc va) or (duc va)) thanh tai cua triet~".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang ((lai hoa) OR (loai hoc)). hieu ve cam ((luc va) or (duc va)) thanh tai cua triet*.