Perhaps you should try some spelling variations:
"comercio del marketing." » "comercio de marketing.", "comercio y marketing.", "comercial de marketing."
"comercio en marketing." » "comercio el marketing.", "comercio de marketing.", "comercio y marketing.", "comercial en marketing.", "comercio den marketing.", "comercio yn marketing."
"comercio e marketing." » "comercio de marketing.", "comercio el marketing.", "comercio y 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 e marketing.") OR ("comercio en marketing."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("comercio del marketing.") OR ((("comercio e marketing.") OR ("comercio en marketing.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"comercio del marketing.\") or (((\"comercio e marketing.\") OR (\"comercio en marketing.\"))))".
• Removing quotes may allow a broader search: (( comercio del marketing. ) or ((( comercio e marketing. ) OR ( comercio en marketing. )))).
• Adding a wildcard symbol may retrieve word variants: (("comercio del marketing.") or ((("comercio e marketing.") OR ("comercio en marketing."))))*.