Perhaps you should try some spelling variations:
"central a research project guidelines." » "central a research policy guidelines.", "central _ research project guidelines.", "central 2 research project guidelines.", "central tax research project guidelines.", "central s.a research project guidelines."
"central a research program stress." » "central a research programs stress.", "central a research program success.", "central a research program synthesis.", "central _ research program stress.", "central 2 research program stress.", "central tax research program stress.", "central s.a 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 a research project guidelines.") or ("central a research program stress."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central a research project guidelines.") OR ("central a research program stress."))*.
• Removing quotes may allow a broader search: (( central a research project guidelines. ) or ( central a research program stress. ))*.