Perhaps you should try some spelling variations:
vision theory » decision theory, action theory, dimension theory
vision theme » vision three, vision time, visit them
die imagery » line imagery, time imagery, der imagery
best world » post world, best worst, next world
net world » next world, text world, net worth

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: 2008 ((net world) OR (best world)) die imagery ((vision theme) OR (vision theory)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "2008 ((net world) OR (best world)) die imagery ((vision theme) or (vision theory))".
• Adding a wildcard symbol may retrieve word variants: 2008 ((net world) OR (best world)) die imagery ((vision theme) or (vision theory))*.