Perhaps you should try some spelling variations:
"enhanced vision system" » "enhanced visionen system" (Expand Search)
"enhanced visionar system" » "enhanced visionenar system" (Expand Search), "enhanced missionar system" (Expand Search), "enhanced visionen system" (Expand Search)
"enhanced visionenar system" » "enhanced visionenenar system" (Expand Search), "enhanced visionen 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 visionar system"))) OR ("enhanced visionenar system"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"enhanced vision system\") OR (\"enhanced visionar system\"))) OR (\"enhanced visionenar system\"))".
• Removing quotes may allow a broader search: (((( enhanced vision system ) OR ( enhanced visionar system ))) OR ( enhanced visionenar system )).
• Adding a wildcard symbol may retrieve word variants: (((("enhanced vision system") OR ("enhanced visionar system"))) OR ("enhanced visionenar system"))*.