Perhaps you should try some spelling variations:
immersion lens » immersion lena, immersion lenses, immersion des
immersed lens » immersed ehv, immersed n
oil immersed » _ immersed
_ immersion » _ immersive

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: (( oil immersed lens ) OR ( _ immersion lens )).
• Adding a wildcard symbol may retrieve word variants: (( oil immersed lens ) or ( _ immersion lens ))*.