Perhaps you should try some spelling variations:
van thang » van thanh, van khang, van than
van hang » van khang, van hoang, ban hang
so sach » so sanh, bo sach, co sach
bao luc » bao thuc
dau cua » dai cua, day cua, cau cua
cua tuc » cua duc, cua tu, cua thuoc
hieu va » lieu va, hieu qua
hieu ve » hieu van
xang xa » lang xa, mang xa, ang xa
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 y xang xa hoi. ((hieu ve) or (hieu va)) bao luc ((van hang) OR (van thang)) dau cua tuc~.
• 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 luc ((van hang) OR (van thang)) dau cua tuc.
• 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 luc ((van hang) OR (van thang)) dau cua tuc".
• Adding a wildcard symbol may retrieve word variants: so sach y xang xa hoi. ((hieu ve) or (hieu va)) bao luc ((van hang) OR (van thang)) dau cua tuc*.