Perhaps you should try some spelling variations:
so sanh » do sanh
cao luc » bao luc, cao duc, cao suc
va hang » van hang, va nang, va lang
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu van
sanh y » sinh y, anh y, hanh y
luc va » duc va, tuc va, loc va
y xang » ty xang
di cua » doi cua, de cua, do cua

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 xa hoi. ((hieu ve) or (hieu va)) cao luc va hang ((di cua) OR (dai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y xang xa hoi. ((hieu ve) OR (hieu va)) cao luc va hang ((di cua) OR (dai cua)) tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y xang xa hoi. ((hieu ve) or (hieu va)) cao luc va hang ((di cua) OR (dai cua)) tu*".