Perhaps you should try some spelling variations:
peter murray » protter murray, petrie murray
peter gray » peter grant, peter graham, peter graber
peter bray » peter brady, peter brian, peter bratt
peter graf » peter grant
peter ray » peter rae, peter read, peter ravn

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: ((((((((peter gray) OR (peter bray))) OR (peter murray))) OR (peter ray))) OR (peter graf)) (bioengineer).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((peter gray) OR (peter bray))) or (peter murray))) or (peter ray))) or (peter graf)) (bioengineer)".
• Adding a wildcard symbol may retrieve word variants: ((((((((peter gray) OR (peter bray))) or (peter murray))) or (peter ray))) or (peter graf)) (bioengineer)*.