Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
danh tai » doanh tai, hanh tai, anh tai
dinh tai » dinh toai, dinh tri, dinh thi
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
van hac » van hoc, van ha, van hai
hac xuc » chat xuc
xuc va » duc va, tuc va, luc 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 sach y ((nang x) OR (lang xa)) hoi. hieu van hac xuc va ((danh tai) OR (dinh tai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang x) or (lang xa)) hoi. hieu van hac xuc va ((danh tai) OR (dinh tai)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang x) or (lang xa)) hoi. hieu van hac xuc va ((danh tai) OR (dinh tai)) cua triet*.