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

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