Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh than » hanh han, hanh nhan, hanh phan
cac luan » cac luat, sach luan, cac dan
van hanh » van thanh, ban hanh, van anh
than cua » nhan cua, thai cua, ban cua
te sach » toc sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

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 x) OR (lang xa)) hoi. hieu ve cac luan van hanh than cua triet~.
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang x) or (lang xa)) hoi. hieu ve cac luan van hanh than cua triet*.