Perhaps you should try some spelling variations:
picton davies » doctor davies, simon davies, wilson davies
vector davies » doctor davies, peter davies, sector david
vector series » vector species, vector derived, vector splines
owen » open, own
hector » sector, rector

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: owen ((((picton davies) OR (hector davies))) OR (((vector davies) OR (vector series)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "owen ((((picton davies) OR (hector davies))) or (((vector davies) or (vector series))))".
• Adding a wildcard symbol may retrieve word variants: owen ((((picton davies) OR (hector davies))) or (((vector davies) or (vector series))))*.