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

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