Perhaps you should try some spelling variations:
"evidence-based synthesis problems" » "evidence-based synthesis problem", "evidence-acid synthesis problems"
"Evidence-based synthesis process" » "Evidence-based synthesis processing", "Evidence-based synthesis problem", "Evidence-based synthesis properties", "Evidence-acid synthesis process"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("Evidence-based synthesis process") OR ("evidence-based synthesis problems")).
• Removing quotes may allow a broader search: (( Evidence-based synthesis process ) or ( evidence-based synthesis problems )).
• Adding a wildcard symbol may retrieve word variants: (("Evidence-based synthesis process") or ("evidence-based synthesis problems"))*.