Perhaps you should try some spelling variations:
"value co ratios" » "value o ratios", "value c ratios", "value ca ratios", "value h2o ratios", "value co ratioss", "value c5 ratios", "value c2 ratios"
"value co ratio" » "value h2o ratio", "value co ratios", "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 co ratios"))) OR ("value o ratio"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"value co ratio\") OR (\"value co ratios\"))) or (\"value o ratio\"))*".
• Removing quotes may allow a broader search: (((( value co ratio ) OR ( value co ratios ))) or ( value o ratio ))*.