Perhaps you should try some spelling variations:
ethical committees » technical committees, technical committee
medical committee » judicial committee, technical committee, general committee
ethics commitee » ethics computer, ethics commitments, ethics competence

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: ((((((ethics commitee) OR (ethics committee))) OR (((ethical committees) OR (medical committee))))) OR (ethics committees)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((ethics commitee) or (ethics committee))) or (((ethical committees) OR (medical committee))))) or (ethics committees))".
• Adding a wildcard symbol may retrieve word variants: ((((((ethics commitee) or (ethics committee))) or (((ethical committees) OR (medical committee))))) or (ethics committees))*.