Perhaps you should try some spelling variations:
"central 2 research program stress." » "central 2 research programs stress.", "central 2 research project stress.", "central 2 research program synthesis.", "central _ research program stress.", "central 1 research program stress.", "central 7 research program stress."
"central 2 research program success." » "central 2 research programs success.", "central 2 research project success.", "central _ research program success.", "central 1 research program success.", "central 7 research program success."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("central 2 research program stress.") OR ("central 2 research program success."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"central 2 research program stress.\") OR (\"central 2 research program success.\"))".
• Removing quotes may allow a broader search: (( central 2 research program stress. ) OR ( central 2 research program success. )).
• Adding a wildcard symbol may retrieve word variants: (("central 2 research program stress.") OR ("central 2 research program success."))*.