Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh than » hanh han, hanh nhan, hanh phan
hieu van » hieu va, thien van, lieu va
than cua » nhan cua, thai cua, ban cua
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van

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 y ((nang x) OR (lang xa)) hoi. ((hieu ve) OR (hieu van)) cac luc van hanh than cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang x) or (lang xa)) hoi. ((hieu ve) OR (hieu van)) cac luc van hanh than cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang x) or (lang xa)) hoi. ((hieu ve) OR (hieu van)) cac luc van hanh than cua triet*.