Perhaps you should try some spelling variations:
primare visual » primary visual, primate visual, primate's visual
das primare » die primare, das primat
visual tree » visual theme, visual trace, visual time
2008 11th » 2008 5th
world das » world data, world does, world do
2008 1st » 2008 21st, 2008 10th, 2008 16th

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 1st) OR (2008 11th)) world das primare visual tree".
• Adding a wildcard symbol may retrieve word variants: ((2008 1st) OR (2008 11th)) world das primare visual tree*.