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 major" » "Optician and scientific interests major", "Optician and scientific intent major", "Optician and scientific inference major", "Optician and scientific interact major", "Optician and scientific interest factor", "Optician and scientific interest paper"

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