Perhaps you should try some spelling variations:
"carthusian / european / congresses" » "carthusianae / european / congresses", "cartesian / european / congresses", "carthusian / european / congress"
"malthusian / european / congresses" » "malthusian / european / congress", "malthusianism / european / congresses"

Try widening your search to All Fields.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"carthusian / european / congresses\") OR (\"malthusian / european / congresses\"))".
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• Adding a wildcard symbol may retrieve word variants: (("carthusian / european / congresses") OR ("malthusian / european / congresses"))*.