Perhaps you should try some spelling variations:
"value n2o reactions" » "value two reactions", "value bio reactions", "value co reactions", "value 2 reactions", "value npv reactions", "value 12 reactions"
"value hdo reaction" » "value h2o reaction", "value 16o reaction", "value o reaction", "value how reaction", "value 1d reaction", "value h reaction"
"value co ratio" » "value co ratios", "value o ratio", "value h2o 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 n2o reactions") OR ("value hdo reaction")))).
• Removing quotes may allow a broader search: (( value co ratio ) or ((( value n2o reactions ) or ( value hdo reaction )))).
• Adding a wildcard symbol may retrieve word variants: (("value co ratio") or ((("value n2o reactions") or ("value hdo reaction"))))*.