Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thien van » thi van
van luan » van quan, van tuan, von luan
luoc van » luoc can, luoc va, luc van
sach thu » sach thue, sach thieu, sach tham
luan va » luan van, luat va
te sach » toc sach
nang xa » lang xa, nang ma, mang xa
va cua » va chua, via cua, ca cua

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 thu ((nang xa) OR (nang x)) hoi. ((lieu va) OR (thien van)) tom luoc van luan va cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu ((nang xa) OR (nang x)) hoi. ((lieu va) or (thien van)) tom luoc van luan va cua triet~".
• Adding a wildcard symbol may retrieve word variants: te sach thu ((nang xa) OR (nang x)) hoi. ((lieu va) or (thien van)) tom luoc van luan va cua triet*.