Perhaps you should try some spelling variations:
"value h2o ratio" » "value h2o reaction", "value how ratio", "value 2 ratio", "value 12 ratio", "value h2o ratios", "value h2a ratio", "value h25 ratio"
"value co ratio" » "value co ratios", "value 2 ratio", "value 8 ratio", "value ca ratio", "value c5 ratio"
"value o ratio" » "value 4 ratio", "value 3 ratio", "value 2 ratio", "value o ratios", "value a ratio", "value 5 ratio"

Try widening your search to All Fields.

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")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"value co ratio\") or (((\"value h2o ratio\") OR (\"value o ratio\"))))".
• Removing quotes may allow a broader search: (( value co ratio ) or ((( value h2o ratio ) OR ( value o ratio )))).
• Adding a wildcard symbol may retrieve word variants: (("value co ratio") or ((("value h2o ratio") OR ("value o ratio"))))*.