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

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