Perhaps you should try some spelling variations:
"value h2o reaction" » "value hdo reaction", "value n2o reactions", "value 16o reaction", "value how reaction", "value 2 reaction", "value 12 reaction"
"value co ratio" » "value co ratios", "value h2o ratio", "value c5 ratio", "value c2 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 o ratio"))) OR ("value h2o reaction")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"value co ratio\") OR (\"value o ratio\"))) or (\"value h2o reaction\"))".
• Removing quotes may allow a broader search: (((( value co ratio ) OR ( value o ratio ))) or ( value h2o reaction )).
• Adding a wildcard symbol may retrieve word variants: (((("value co ratio") OR ("value o ratio"))) or ("value h2o reaction"))*.