Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van nang » van quang, van ban, van dong
cam thuc » nam thuc, cam thu, can thuc
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
su sach » vu sach
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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