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

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("Evidence-acid synthesis program") OR ("evidence-based synthesis process")).
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