Perhaps you should try some spelling variations:
"volunteer across borders-sloop" » "volunteers across borders-sloop", "volunteering across borders-sloop", "volunteering cross borders-sloop", "volunteer cross border-sloop"
"counter across brief-sloop" » "counter macros brief-sloop", "encounters across brief-sloop", "countries across brief-sloop", "counter across barrier-sloop", "counter across border-sloop", "counter across darien-sloop"

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: (("volunteer across borders-sloop") OR ("counter across brief-sloop"))*.
• Removing quotes may allow a broader search: (( volunteer across borders-sloop ) or ( counter across brief-sloop ))*.