Perhaps you should try some spelling variations:
"american philosoph" » "american philosophy", "american philosophical", "african philosopher"
"african philosophy" » "american philosophy", "indian philosophy", "roman philosophy"
"america philosophy" » "american philosophy", "media philosophy", "medical philosophy"

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: (((("american philosoph") OR ("african philosophy"))) OR ("america philosophy")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"american philosoph\") OR (\"african philosophy\"))) or (\"america philosophy\"))".
• Removing quotes may allow a broader search: (((( american philosoph ) OR ( african philosophy ))) or ( america philosophy )).
• Adding a wildcard symbol may retrieve word variants: (((("american philosoph") OR ("african philosophy"))) or ("america philosophy"))*.