Perhaps you should try some spelling variations:
"comercio del marketing." » "comercio de marketing.", "comercio e marketing.", "comercio y marketing."
"comercio dde marketing." » "comercio de marketing.", "comercio trade marketing.", "comercio tele marketing.", "comercio e marketing.", "comercios de marketing."
"comercio en marketing." » "comercio el marketing.", "comercio de marketing.", "comercio y marketing.", "comercial en marketing."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("comercio del marketing.") or ("comercio dde marketing."))) or ("comercio en marketing."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("comercio del marketing.") OR ("comercio dde marketing."))) OR ("comercio en marketing.")).
• Removing quotes may allow a broader search: (((( comercio del marketing. ) or ( comercio dde marketing. ))) or ( comercio en marketing. )).
• Adding a wildcard symbol may retrieve word variants: (((("comercio del marketing.") or ("comercio dde marketing."))) or ("comercio en marketing."))*.