Perhaps you should try some spelling variations:
"research laboratories" » "research laboratory"
"federal laboratories" » "chemical laboratories", "bell laboratories", "general laboratory"
"virtual laboratories" » "virtual laboratory"

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: (((("federal laboratories") OR ("virtual laboratories"))) OR ("research laboratories")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"federal laboratories\") OR (\"virtual laboratories\"))) or (\"research laboratories\"))".
• Removing quotes may allow a broader search: (((( federal laboratories ) OR ( virtual laboratories ))) or ( research laboratories )).
• Adding a wildcard symbol may retrieve word variants: (((("federal laboratories") OR ("virtual laboratories"))) or ("research laboratories"))*.