Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cac thuc » cach thuc, cac thu, can thuc
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va
sach v » sach va, sach y, sach 2
di cua » dai cua, doi cua, de 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: su sach v ((nang xa) OR (nang x)) hoi. ((hieu ve) OR (hieu van)) cac thuc van hanh di cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang xa) or (nang x)) hoi. ((hieu ve) OR (hieu van)) cac thuc van hanh di cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang xa) or (nang x)) hoi. ((hieu ve) OR (hieu van)) cac thuc van hanh di cua triet*.