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

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