Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
hang doi » hang di, hang loi, huong doi
cam thuc » am thuc, nam thuc, cam thu
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
co sach » bo sach, cuon sach, hoc sach
so sach » so sanh, bo sach, hoc sach
va cam » va cham, va cac, va cao
y lang » o lang, _ lang, tay lang

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