Perhaps you should try some spelling variations:
"_ corporation technical report series" » "_ corporation ethical report series", "_ corporation technological report series", "_ collaboration technical report series", "_ corporation technical report server", "_ corporate technical report series"
"_ corporation medical report series" » "_ corporation america report series", "_ corporation ethical report series", "_ corporation fedoral report series", "_ corporation medical reports series", "_ corporation medical record series", "_ corporation medical records series", "_ corporation medical report server", "_ corporate medical report series"
"_ operation technical report series" » "_ operations technical report series", "_ iteration technical report series", "_ operative technical report series", "_ operation technical report server", "_ operating technical report series"

Try widening your search to All Fields.

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: (((("_ corporation technical report series") OR ("_ corporation medical report series"))) OR ("_ operation technical report series")).
• Removing quotes may allow a broader search: (((( _ corporation technical report series ) or ( _ corporation medical report series ))) or ( _ operation technical report series )).
• Adding a wildcard symbol may retrieve word variants: (((("_ corporation technical report series") or ("_ corporation medical report series"))) or ("_ operation technical report series"))*.