Perhaps you should try some spelling variations:
hang doi » hang di, hang loi, huong doi
bao thuc » cao thuoc, am thuc, va thuc
so sach » bo sach, co sach, hoc sach
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
so sanh » do sanh
va hang » van hang, va nang, va lang
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu van
thuc va » thuc vat, thuc dan, thuc day
cua tu » cua tuc, cua su, cua cu
y xang » ty xang

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