Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thien van » thi van
hanh tai » thanh tai, hang tai, han tai
hanh dai » hanh dao, vanh dai, thanh dat
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
van dau » van dao, phan dau
dau xac » dau xay, dan xac
xac va » tac va, ac va, bac 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: tu sach y ((nang xa) OR (nang x)) hoi. thien van dau xac va ((hanh dai) OR (hanh tai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) OR (nang x)) hoi. thien van dau xac va ((hanh dai) or (hanh tai)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) OR (nang x)) hoi. thien van dau xac va ((hanh dai) or (hanh tai)) cua triet*.