Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc van » thuc dan, thuc va, thuc hanh
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, hieu van
sach v » sach va, sach y, sach 2
ve cac » va cac, vien cac
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 cac ((thuc van) OR (thuc vat)) 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 cac ((thuc van) OR (thuc vat)) hanh di cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang xa) or (nang x)) hoi. hieu ve cac ((thuc van) OR (thuc vat)) hanh di cua triet*.