Perhaps you should try some spelling variations:
"poll equation" » "pell equation", "pell equations", "pol's equation", "polyl equation"
"pool equation" » "pell equation", "pol equations", "pool evaluation"
"pole equation" » "cole equation", "people equation", "pol's equation", "polye equation"
"pol equation" » "poly 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 ("pool equation"))) OR ("poll equation"))) OR ("pole equation")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"pol equation\") OR (\"pool equation\"))) or (\"poll equation\"))) or (\"pole equation\"))".
• Removing quotes may allow a broader search: (((((( pol equation ) OR ( pool equation ))) or ( poll equation ))) or ( pole equation )).
• Adding a wildcard symbol may retrieve word variants: (((((("pol equation") OR ("pool equation"))) or ("poll equation"))) or ("pole equation"))*.