Perhaps you should try some spelling variations:
american activities » american authorities, american cities
"American activities during" » "American activity during"
"american citizen services" » "american citizens services", "american cities services", "american children services", "american driven services", "american between services"

Try widening your search to All Fields.

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: (("American activities during") OR ("american citizen services")).
• Removing quotes may allow a broader search: (( American activities during ) or ( american citizen services )).
• Adding a wildcard symbol may retrieve word variants: (("American activities during") or ("american citizen services"))*.