Perhaps you should try some spelling variations:
"ibm operational research center" » "ibm operations research center" (Expand Search), "ibm operational research centre" (Expand Search), "ibm operational research career" (Expand Search), "ibm operational research under" (Expand Search), "i operational research center" (Expand Search), "from operational research center" (Expand Search), "_ operational research center" (Expand Search)
"_ national research center" » "_ educational research center" (Expand Search), "_ translational research center" (Expand Search), "_ international research center" (Expand Search), "_ national research centre" (Expand Search), "_ national research career" (Expand Search), "_ national research under" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("_ national research center") OR ("ibm operational research center"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"_ national research center\") OR (\"ibm operational research center\"))".
• Removing quotes may allow a broader search: (( _ national research center ) OR ( ibm operational research center )).
• Adding a wildcard symbol may retrieve word variants: (("_ national research center") OR ("ibm operational research center"))*.