Perhaps you should try some spelling variations:
"junior researchers learn" » "action researchers learn", "gender researchers learn", "junior researchers a"
"how researchers learn" » "how researchers a", "co researchers learn", "do researchers learn", "_ researchers learn"

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: (("junior researchers learn") OR ("how researchers learn")).
• Removing quotes may allow a broader search: (( junior researchers learn ) or ( how researchers learn )).
• Adding a wildcard symbol may retrieve word variants: (("junior researchers learn") or ("how researchers learn"))*.