Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, cam thu, can thuc
hanh doi » thanh doi, hanh noi, hang doi
nam thuc » nam thuoc, am thuc, nam thu
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
su sach » vu sach
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
va nang » van nang, da nang, cam nang
so sach » so sanh, bo sach, co sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) va nang cao hoi. hieu ve ((cam thuc) or (nam thuc)) va hanh doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) va nang cao hoi. hieu ve ((cam thuc) OR (nam thuc)) va hanh doi cua triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) va nang cao hoi. hieu ve ((cam thuc) or (nam thuc)) va hanh doi cua triet*.