Perhaps you should try some spelling variations:
function relationship » function relationships
spatial relationships » spatial relations, functional relationships
animal relationships » functional relationships
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 (((social relationships) OR (function relationship))))) OR (spatial relationships)).
• Adding a wildcard symbol may retrieve word variants: ((((animal relationships) or (((social relationships) or (function relationship))))) or (spatial relationships))*.