Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc day » thuc vat
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
qua cam » qua cham, qua cac, qua ca
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 (co sach)) ky nang o hoi. hieu qua 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 qua 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 qua cam ((thuc day) or (thuc dan)) hanh vi cua triet*.