Perhaps you should try some spelling variations:
"multi empirical analysis" » "multi numerical analysis", "quasi empirical analysis", "lolli empirical analysis", "results empirical analysis"
"multi criteria analysis" » "multi critical analysis"
"multi statistical analysis" » "mali statistical analysis", "multiple statistical analysis", "malawi statistical analysis"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi criteria analysis") OR ((("multi empirical analysis") OR ("multi statistical analysis")))).
• Removing quotes may allow a broader search: (( multi criteria analysis ) or ((( multi empirical analysis ) or ( multi statistical analysis )))).
• Adding a wildcard symbol may retrieve word variants: (("multi criteria analysis") or ((("multi empirical analysis") or ("multi statistical analysis"))))*.