Perhaps you should try some spelling variations:
"central a research program stress." » "central a research programs stress.", "central a research project stress.", "central a research program success.", "central _ research program stress.", "central tax research program stress.", "central s.a research program stress."
"central 2 research program synthesis." » "central 2 research programs synthesis.", "central 2 research project synthesis.", "central _ research program synthesis.", "central de research program synthesis."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("central a research program stress.") or ("central 2 research program synthesis."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central a research program stress.") OR ("central 2 research program synthesis.")).
• Removing quotes may allow a broader search: (( central a research program stress. ) or ( central 2 research program synthesis. )).
• Adding a wildcard symbol may retrieve word variants: (("central a research program stress.") or ("central 2 research program synthesis."))*.