Perhaps you should try some spelling variations:
van thang » van thanh, van khang, van than
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
sach thu » sach thue, sach thieu, sach tham
van hang » van khang, van hoang, ban hang
nam thuc » nam thuoc, am thuc, nam thu
thu nang » thi nang, thu hang, thu bang
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, co 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 thu nang x hoi. hieu ve nam thuc ((van hang) OR (van thang)) vi ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu nang x hoi. hieu ve nam thuc ((van hang) OR (van thang)) vi ((va triet) OR (su triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu nang x hoi. hieu ve nam thuc ((van hang) OR (van thang)) vi ((va triet) or (su triet))*".