Perhaps you should try some spelling variations:
primaren visual » primary visual, primate visual, primate's visual
visual thermal » ideal thermal, seal thermal, visual terms
die primaren » die primare, der primaren, des primaren
2008 4th » 2008 5th, 2008 11th, 2008 10th
2008 ts » 2008 5th, 2008 9th, 2008 7th

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((2008 ts) OR (2008 4th)) worlds die primaren visual thermal".
• Adding a wildcard symbol may retrieve word variants: ((2008 ts) OR (2008 4th)) worlds die primaren visual thermal*.