Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
hang di » hang doi, hang vi, hang dien
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
xang xa » lang xa, mang xa, ang xa
y xang » ty xang
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 hoi. ((hieu ve) or (hieu va)) bao ((thuc va) OR (thuc day)) hang di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y xang xa hoi. ((hieu ve) OR (hieu va)) bao ((thuc va) OR (thuc day)) hang di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y xang xa hoi. ((hieu ve) or (hieu va)) bao ((thuc va) OR (thuc day)) hang di cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach y xang xa hoi. ((hieu ve) or (hieu va)) bao ((thuc va) OR (thuc day)) hang di cua tu*.