Perhaps you should try some spelling variations:
yorker volunteer » worker volunteer, workers volunteers, yorkshire volunteer
agents treatment » patients treatment, aspects treatment, genetics treatment
adults treatment » its treatment, arts treatments
new yorker » new york, new york's
infantry » infant, infants, infancy
regiment » regimen, regimes, regime

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: (( 7th new yorker volunteer infantry regiment ) OR ( 7th new yorker volunteer ((agents treatment) OR (adults treatment)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( 7th new yorker volunteer infantry regiment ) or ( 7th new yorker volunteer ((agents treatment) OR (adults treatment)) ))".
• Adding a wildcard symbol may retrieve word variants: (( 7th new yorker volunteer infantry regiment ) or ( 7th new yorker volunteer ((agents treatment) OR (adults treatment)) ))*.