Perhaps you should try some spelling variations:
functional relationships » function relationships, function relationship
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 (spatial relationships)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((animal relationships) OR (functional relationships))) or (spatial relationships))".
• Adding a wildcard symbol may retrieve word variants: ((((animal relationships) OR (functional relationships))) or (spatial relationships))*.