Perhaps you should try some spelling variations:
mirror laboratory » monitor laboratory, inter laboratory, labor laboratory
cold spraying » cold spring, cold spray, cold sprayed
world spring » world during, world print, world seeing

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: ((cold spraying) OR (world spring)) mirror laboratory.
• Adding a wildcard symbol may retrieve word variants: ((cold spraying) or (world spring)) mirror laboratory*.