Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh than » hanh han, hanh nhan, hanh phan
hieu vien » hieu hien, hieu viec, thieu nien
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
than cua » nhan cua, thai cua, ban cua
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cac luc » cau luc, coc luc, cac cuoc
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 vien ((cac luc) OR (cac nuoc)) 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 vien ((cac luc) OR (cac nuoc)) van hanh than cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang x) or (lang xa)) hoi. hieu vien ((cac luc) OR (cac nuoc)) van hanh than cua triet*.