Perhaps you should try some spelling variations:
so sanh » do sanh
hieu va » lieu va, hieu qua
hang di » hang doi, hang vi, hang dien
va hang » van hang, va nang, va lang
hieu ve » hieu van
cao luc » bao luc, cao duc, cao suc
di cua » dai cua, doi cua, de cua
luc va » duc va, tuc va, loc va
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 sanh ((y xang) OR (ty xang)) xa hoi. ((hieu ve) or (hieu va)) cao luc va hang di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ((y xang) OR (ty xang)) xa hoi. ((hieu ve) OR (hieu va)) cao luc va hang di cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ((y xang) OR (ty xang)) xa hoi. ((hieu ve) or (hieu va)) cao luc va hang di cua tu*".