Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, cam thu
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
nang o » nang co, nang ho, nang ro
ve cam » ve cham, ve cac, va cam
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 (co sach)) ky nang o hoi. hieu ve cam thuc day hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang o hoi. hieu ve cam thuc day hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang o hoi. hieu ve cam thuc day hanh vi cua triet*.