Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
vanh dai » van dai, vanh tai, lanh dao
toc sach » hoc sach, doc sach, thuoc sach
hanh dai » hanh tai, hanh dao, thanh dat
toc sac » toc san, hoc sach, doc sach
van cac » van hac, van cau, van bac
cac co » cac cong
co va » co ma, do va, so va
x hoi » xa hoi, o hoi, x ho

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: ((toc sac) OR (toc sach)) ky nang x hoi. hieu van cac co va ((hanh dai) OR (vanh dai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (toc sach)) ky nang x hoi. hieu van cac co va ((hanh dai) or (vanh dai)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) OR (toc sach)) ky nang x hoi. hieu van cac co va ((hanh dai) or (vanh dai)) cua triet*.