Perhaps you should try some spelling variations:
"poly equation" » "golay equation", "pol's equation", "py equation", "pooly equation", "polly equation"
"pole equation" » "cole equation", "people equation", "pol's equation", "poole equation", "polle equation"
"pol equation" » "pool equation", "poll equation"

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: (((("pol equation") OR ("pole equation"))) OR ("poly equation")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"pol equation\") OR (\"pole equation\"))) or (\"poly equation\"))".
• Removing quotes may allow a broader search: (((( pol equation ) OR ( pole equation ))) or ( poly equation )).
• Adding a wildcard symbol may retrieve word variants: (((("pol equation") OR ("pole equation"))) or ("poly equation"))*.