Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
hanh than » hanh han, hanh nhan, hanh phan
than cua » nhan cua, thai cua, ban cua
vien cac » vien bach, vien dai, vien da
lang van » dang van, tang van, hoang van
luc van » luoc van, duc van, luc va
luu van » cuu van, luan van, luu hanh
tu sach » thu sach, su sach, te sach

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 van)) hoi. hieu vien cac ((luc van) OR (luu 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 van)) hoi. hieu vien cac ((luc van) OR (luu van)) hanh than cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang x) or (lang van)) hoi. hieu vien cac ((luc van) OR (luu van)) hanh than cua triet*.