Perhaps you should try some spelling variations:
"central basic research program success." » "central basic research programs success.", "central basic research project success.", "central based research program success.", "central asia research program success.", "central bajio research program success.", "neutral basic research program success."
"central action research program stress." » "central action research programs stress.", "central action research project stress.", "central national research program stress.", "central section research program stress.", "central nation research program stress.", "centric action research program stress.", "central action 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 basic research program success.") or ("central action research program stress."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central basic research program success.") OR ("central action research program stress.")).
• Removing quotes may allow a broader search: (( central basic research program success. ) or ( central action research program stress. )).
• Adding a wildcard symbol may retrieve word variants: (("central basic research program success.") or ("central action research program stress."))*.