Perhaps you should try some spelling variations:
"Optician and scientific concept cancer" » "Optician and scientific concepts cancer", "Optician and scientific context cancer", "Optician and scientific content cancer", "Optician and scientific concept chapter", "Optician and scientific concerns cancer", "Optician and scientific concept car"
"optician and scientific intent maker" » "optician and scientific content maker", "optician and scientific interest maker", "optician and scientific context maker", "optician and scientific internet makes", "optician and scientific intent model"

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