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