Perhaps you should try some spelling variations:
"imaginary places" » "imaginary parts", "imaginary monies", "imaginary part"
"imaginary unit" » "imaginary part", "imaginary axis", "imaginary bci"
"imaginary i" » "imaginary _", "imaginary 2", "imaginary 3"

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: (((("imaginary unit") OR ("imaginary i"))) OR ("imaginary places")).
• Removing quotes may allow a broader search: (((( imaginary unit ) or ( imaginary i ))) or ( imaginary places )).
• Adding a wildcard symbol may retrieve word variants: (((("imaginary unit") or ("imaginary i"))) or ("imaginary places"))*.