Perhaps you should try some spelling variations:
primate's visual » primate visual, primary visual, images visual
primaren visual » primary visual, primate visual, imagen visual
2008 9th » 2008 5th, 2018 9th, 2008 11th
2008 4th » 2008 5th, 2008 11th, 2008 10th
2008 ts » 2008 5th, 2008 7th, 2008 8th

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 ts) OR (2008 9th))) OR (2008 4th)) worlds die ((primaren visual) OR (primate's visual)) thermal.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((2008 ts) OR (2008 9th))) or (2008 4th)) worlds die ((primaren visual) or (primate's visual)) thermal".
• Adding a wildcard symbol may retrieve word variants: ((((2008 ts) OR (2008 9th))) or (2008 4th)) worlds die ((primaren visual) or (primate's visual)) thermal*.