Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
van hai » van ha, van chat, van hanh
hai cuc » tai cuc, hai cua, thai cua
sach v » sach va, sach y, sach vay
cuc va » chuc va, duc va, cuu va
sach 2 » sach y

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 v) OR (sach 2)) nang x ho. hieu van hai cuc va ((hanh di) OR (hanh de)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach v) OR (sach 2)) nang x ho. hieu van hai cuc va ((hanh di) or (hanh de)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach v) OR (sach 2)) nang x ho. hieu van hai cuc va ((hanh di) or (hanh de)) cua triet*.