Perhaps you should try some spelling variations:
world conference » working conference
conference amast » conference acisp, conference acns, conference adma
amast rabies » against rabies, man rabies, post rabies
navies 2001 » devices 2001, reviews 2001
rabies 20 » rabies 10, rabies 2, rabies 23

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: (( world conference amast ((rabies 2001) OR (navies 2001)) ) OR ( world conference amast rabies 20 )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( world conference amast ((rabies 2001) OR (navies 2001)) ) or ( world conference amast rabies 20 ))".
• Adding a wildcard symbol may retrieve word variants: (( world conference amast ((rabies 2001) OR (navies 2001)) ) or ( world conference amast rabies 20 ))*.