Perhaps you should try some spelling variations:
bao thuc » cao thuoc, am thuc, va thuc
so sach » so sanh, bo sach, co sach
xang xa » lang xa, ang xa, dang xay
hang di » hang doi, hang vi, hang dien
mang xa » lang xa, mang may, dang xay
hieu ve » hieu van
va hang » van hang, va nang, va lang
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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 y ((xang xa) OR (mang xa)) hoi. ((hieu ve) or (hieu va)) bao thuc va hang di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((xang xa) OR (mang xa)) hoi. ((hieu ve) OR (hieu va)) bao thuc va hang di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((xang xa) OR (mang xa)) hoi. ((hieu ve) or (hieu va)) bao thuc va hang di cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach y ((xang xa) OR (mang xa)) hoi. ((hieu ve) or (hieu va)) bao thuc va hang di cua tu*.