Perhaps you should try some spelling variations:
ideographic classifications » geographic classifications, demographic classification, biogeographic classification
ideographic classification » demographic classification, biogeographic classification, demographics classification

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: ((ideographic classifications) OR (ideographic classification)).
• Adding a wildcard symbol may retrieve word variants: ((ideographic classifications) or (ideographic classification))*.