Perhaps you should try some spelling variations:
"value h2o ratios" » "value h2o ratio", "value o ratios", "value 12c ratios", "value how ratios", "value 2 ratios", "value 12 ratios"
"value co ratio" » "value co ratios", "value o ratio", "value h2o ratio"
"value a ratio" » "value a radio", "value a rating"

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 ratios") OR ("value a ratio")))).
• Removing quotes may allow a broader search: (( value co ratio ) or ((( value h2o ratios ) or ( value a ratio )))).
• Adding a wildcard symbol may retrieve word variants: (("value co ratio") or ((("value h2o ratios") or ("value a ratio"))))*.