Perhaps you should try some spelling variations:
young's equation » young equation, john's equation, young's relation
saha's equation » saha equation, zakai's equation, wald's equation
pole equation » pol equation, cole equation, people 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: ((((young's equation) OR (saha's equation))) OR (pole equation)).
• Adding a wildcard symbol may retrieve word variants: ((((young's equation) or (saha's equation))) or (pole equation))*.