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

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 (function relationships))) OR (social relationships))))) OR (spatial relationships)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((animal relationships) or (((((functional relationships) OR (function relationships))) or (social relationships))))) or (spatial relationships))".
• Adding a wildcard symbol may retrieve word variants: ((((animal relationships) or (((((functional relationships) OR (function relationships))) or (social relationships))))) or (spatial relationships))*.