Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
van hang » van khang, van hoang, van thang
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
thu nang » thi nang, thu hang, thu bang
hieu ve » hieu va, hieu van
hang vi » hang va, hanh vi, hang di
co sach » bo sach, cuon sach, hoc sach
so sach » so sanh, bo sach, hoc sach
ve nam » he nam, va nam, le nam
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (co sach)) thu nang x hoi. hieu ve nam thuc van hang vi ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) thu nang x hoi. hieu ve nam thuc van hang vi ((va triet) OR (su triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) thu nang x hoi. hieu ve nam thuc van hang vi ((va triet) or (su triet))*".