Perhaps you should try some spelling variations:
mock volunteers » among volunteers, local volunteers, icu volunteers
york volunteer » form volunteer, worker volunteer, words volunteer
how volunteers » how volunteerism, horse volunteers, downe volunteers
volunteer its » volunteer it's, volunteer iii, volunteer iv
its regiment » his regiment, 9th regiment, das regiment
ist regiment » first regiment, 71st regiment, his regiment

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 york volunteer its regiment ) OR ( 7th new ((mock volunteers) OR (how volunteers)) ist regiment )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( 7th new york volunteer its regiment ) or ( 7th new ((mock volunteers) OR (how volunteers)) ist regiment ))".
• Adding a wildcard symbol may retrieve word variants: (( 7th new york volunteer its regiment ) or ( 7th new ((mock volunteers) OR (how volunteers)) ist regiment ))*.