Perhaps you should try some spelling variations:
"value h2o ratio" » "value how ratio", "value 2 ratio", "value 32 ratio", "value h2o reaction", "value h2o ratios", "value h25 ratio", "value h22 ratio"
"value co ratio" » "value co ratios", "value c5 ratio", "value c2 ratio"
"value 12 ratio" » "value 2 ratio", "value 10 ratio", "value 1 ratio", "value 12 radio", "value n2 ratio"
"value o ratio" » "value 4 ratio", "value 3 ratio", "value 2 ratio", "value o ratios", "value 5 ratio"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("value co ratio") OR ((((("value h2o ratio") OR ("value o ratio"))) OR ("value 12 ratio"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"value co ratio\") or (((((\"value h2o ratio\") OR (\"value o ratio\"))) or (\"value 12 ratio\"))))*".
• Removing quotes may allow a broader search: (( value co ratio ) or ((((( value h2o ratio ) OR ( value o ratio ))) or ( value 12 ratio ))))*.