Perhaps you should try some spelling variations:
functional relationships » function relationships, function relationship, social relationships
spatial relationships » social relationships, spatial relations
animal relationships » social relationships

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: ((((animal relationships) OR (((functional relationships) OR (social relations))))) OR (spatial relationships)).
• Adding a wildcard symbol may retrieve word variants: ((((animal relationships) or (((functional relationships) or (social relations))))) or (spatial relationships))*.