Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
nam thuc » nam thuoc, am thuc, nam thu
va triet » va thiet, va trien, ve triet
hang doi » hang di, hang loi, huong doi
van hang » van khang, van hoang, van thang
thuc van » thuc vat, thuc dan, thuc va
sach thu » sach thue, sach thieu, sach tham
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
ve nam » he nam, va nam, le nam

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 xa) OR (lang xa)) hoi. hieu ve nam thuc van hang doi ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu ((nang xa) OR (lang xa)) hoi. hieu ve nam thuc van hang doi ((va triet) OR (su triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu ((nang xa) OR (lang xa)) hoi. hieu ve nam thuc van hang doi ((va triet) or (su triet))*".