Perhaps you should try some spelling variations:
harbor laboratory » laborg laboratory, mirror laboratory, behavior laboratory
labor laboratory » laboratory laboratory, under laboratory, inter laboratory
cold working » color working, world working, word working

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 working) OR (world during)) ((harbor laboratory) OR (labor laboratory)).
• Adding a wildcard symbol may retrieve word variants: ((cold working) or (world during)) ((harbor laboratory) or (labor laboratory))*.