Perhaps you should try some spelling variations:
biogeographic classification » bibliographic classification, geographic classifications, topographic classification
ideographic classification » demographic classification, demographics classification, radiographic 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 classification) OR (biogeographic classification)).
• Adding a wildcard symbol may retrieve word variants: ((ideographic classification) or (biogeographic classification))*.