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