Perhaps you should try some spelling variations:
workers volunteer » workers volunteers, worker volunteer, words volunteer
others volunteer » brother volunteer, her volunteer, workers volunteers
infancy regiment » infancy treatment
infantry » infant, infants

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