Perhaps you should try some spelling variations:
cesifo textbooks » basic textbooks, using textbooks
"CESifo textbooks series" » "CESifo textbook series", "CESifo textbook memories", "CESifo handbooks series", "CESifo textbooks strips", "CESifo textbooklet series", "CESifo texthooks services", "CESifo textebooks series"
"cesifo books series" » "cesifo books strips", "cesifo booklet series", "cesifo hooks services", "cesifo ebooks series"
"cesifo book series" » "cesifo ebook series"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("cesifo book series") or ((("cesifo books series") or ("CESifo textbooks series"))))~.
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• Adding a wildcard symbol may retrieve word variants: (("cesifo book series") or ((("cesifo books series") or ("CESifo textbooks series"))))*.