Perhaps you should try some spelling variations:
"enhanced vision system" » "enhanced visionar system" (Expand Search)
"enhanced visionen system" » "enhanced visionaren system" (Expand Search), "enhanced visionar system" (Expand Search)
"Enhanced missionar system" » "Enhanced mission system" (Expand Search), "Enhanced missions system" (Expand Search), "Enhanced visionar system" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("enhanced vision system") OR ((("Enhanced missionar system") OR ("enhanced visionen system"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"enhanced vision system\") OR (((\"Enhanced missionar system\") OR (\"enhanced visionen system\"))))".
• Removing quotes may allow a broader search: (( enhanced vision system ) OR ((( Enhanced missionar system ) OR ( enhanced visionen system )))).
• Adding a wildcard symbol may retrieve word variants: (("enhanced vision system") OR ((("Enhanced missionar system") OR ("enhanced visionen system"))))*.