Perhaps you should try some spelling variations:
critical scientific » original scientific, empirical scientific, medical scientific
clinical scientific » clinical scientist, technical scientific, empirical scientific
mark webber » mr webber, mark weiser, mark yeber
mark weber » marx weber, mark yeber, maria weber

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: ((mark webber) OR (mark weber)) (((clinical scientific) OR (critical scientific))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mark webber) or (mark weber)) (((clinical scientific) OR (critical scientific)))".
• Adding a wildcard symbol may retrieve word variants: ((mark webber) or (mark weber)) (((clinical scientific) OR (critical scientific)))*.