Perhaps you should try some spelling variations:
"optician and scientific instrument maker" » "optician and scientific instruments maker", "optician and scientific investment maker", "optician and scientific intent maker", "optician and scientific instrument player", "optician and scientific instruments naked", "optician and scientific instrument care"
"Optician and scientific internet makes" » "Optician and scientific intent makes", "Optician and scientific interest makes", "Optician and scientific interests makes", "Optician and scientific internet made", "Optician and scientific internet modems", "Optician and scientific internet based"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("optician and scientific instrument maker") or ("Optician and scientific internet makes"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("optician and scientific instrument maker") OR ("Optician and scientific internet makes")).
• Removing quotes may allow a broader search: (( optician and scientific instrument maker ) or ( Optician and scientific internet makes )).
• Adding a wildcard symbol may retrieve word variants: (("optician and scientific instrument maker") or ("Optician and scientific internet makes"))*.