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

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 spring)) ((harbor laboratory) OR (((labor laboratory) OR (laboratory laboratory)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((cold working) or (world spring)) ((harbor laboratory) or (((labor laboratory) OR (laboratory laboratory))))".
• Adding a wildcard symbol may retrieve word variants: ((cold working) or (world spring)) ((harbor laboratory) or (((labor laboratory) OR (laboratory laboratory))))*.