Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
nam thuc » nam thuoc, am thuc, nam thu
cam thuc » am thuc, cam thu, can thuc
hieu ve » hieu va, hieu van
sach va » sach xa, sach ha, sach dao
nang co » nang cao, nang doc, nang noi
va hanh » van hanh, va thanh, va danh
va nang » van nang, da nang, cam nang
su sach » so sach, vu sach
co hoi » co hoc, co loi
vi cua » vai cua, di cua

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 va nang co hoi. hieu ve ((cam thuc) or (nam thuc)) ((va hanh) or (ban hanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach va nang co hoi. hieu ve ((cam thuc) OR (nam thuc)) ((va hanh) OR (ban hanh)) vi cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach va nang co hoi. hieu ve ((cam thuc) or (nam thuc)) ((va hanh) or (ban hanh)) vi cua triet*.