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

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 program") OR ("evidence-based synthesis process"))) OR ((("evidence-acid synthesis program") OR ("evidence-acid synthesis problem")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"evidence-based synthesis program\") OR (\"evidence-based synthesis process\"))) or (((\"evidence-acid synthesis program\") or (\"evidence-acid synthesis problem\"))))".
• Removing quotes may allow a broader search: (((( evidence-based synthesis program ) OR ( evidence-based synthesis process ))) or ((( evidence-acid synthesis program ) or ( evidence-acid synthesis problem )))).
• Adding a wildcard symbol may retrieve word variants: (((("evidence-based synthesis program") OR ("evidence-based synthesis process"))) or ((("evidence-acid synthesis program") or ("evidence-acid synthesis problem"))))*.