Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nham thuc » nhan thuc, nam thuc, nham thu
cham thuc » pham thuc, tham thuc, pham thuoc
hang dai » hoang dai, hang tai, hang dau
va hang » van hang, va nang, va lang
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

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 ((cham thuc) OR (nham thuc)) va hang dai 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 ((cham thuc) OR (nham thuc)) va hang dai cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang xa) or (nang x)) hoi. hieu ve ((cham thuc) OR (nham thuc)) va hang dai cua triet*.