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 interest maker" » "Optician and scientific interests maker", "Optician and scientific intent maker", "Optician and scientific inference maker", "Optician and scientific interest markers", "Optician and scientific interest major", "Optician and scientific interest paper"

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