Perhaps you should try some spelling variations:
"research professional" » "researching professional", "resources professional"
"health professional" » "health professionals", "healthcare professionals"
"health professions" » "health professionals", "healthcare professionals"

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: (("research professional") OR ((("health professional") OR ("health professions")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"research professional\") or (((\"health professional\") OR (\"health professions\"))))".
• Removing quotes may allow a broader search: (( research professional ) or ((( health professional ) OR ( health professions )))).
• Adding a wildcard symbol may retrieve word variants: (("research professional") or ((("health professional") OR ("health professions"))))*.