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