Perhaps you should try some spelling variations:
"sociologist" » "sociological"
"sociologists" » "sociologicals", "sociological"
"radiologists" » "radiological"
"sociologia" » "sociological"

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: (("sociologist" OR "radiologists") OR (("sociologia" OR ("sociologists" OR "biologists")) OR "sociology")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"sociologist\" or \"radiologists\") or ((\"sociologia\" or (\"sociologists\" OR \"biologists\")) or \"sociology\"))".
• Removing quotes may allow a broader search: (( sociologist or radiologists ) or (( sociologia or ( sociologists OR biologists )) or sociology )).
• Adding a wildcard symbol may retrieve word variants: (("sociologist" or "radiologists") or (("sociologia" or ("sociologists" OR "biologists")) or "sociology"))*.