Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan, thuc vat
thuc day » thuc vat
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
co sach » bo sach, cuon sach, hoc sach
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam
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) OR (thuc dan)) 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) OR (thuc dan)) hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky nang o hoi. hieu ve cam ((thuc day) OR (thuc dan)) 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) OR (thuc dan)) hanh vi cua triet*.