Perhaps you should try some spelling variations:
"central _ research program synthesis." » "central _ research programs synthesis.", "central _ research project synthesis."
"central tax research program stress." » "central tax research programs stress.", "central tax research project stress.", "central tax research program success.", "central 2 research program stress.", "central 2.1 research program stress.", "central 2.2 research program stress.", "central taxes research program stress.", "central bank research program stress."

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

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