Perhaps you should try some spelling variations:
"comercio interno" » "mercado interno"
"comercio intra" » "comercio ica", "comercio iptc", "comercio industria"
"comercio entre" » "comercio en"
"comercio para" » "comercial para", "comercio pasto", "comerciales para"
"comercio san" » "comercio en", "comercio de", "comercio tlc"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("comercio exterior") or ((((((("comercio intra") or ("comercio interno"))) or ("comercio entre"))) or ((("comercio para") OR ("comercio san"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("comercio exterior") OR ((((((("comercio intra") OR ("comercio interno"))) OR ("comercio entre"))) OR ((("comercio para") OR ("comercio san")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"comercio exterior\") or (((((((\"comercio intra\") or (\"comercio interno\"))) or (\"comercio entre\"))) or (((\"comercio para\") OR (\"comercio san\"))))))".
• Removing quotes may allow a broader search: (( comercio exterior ) or ((((((( comercio intra ) or ( comercio interno ))) or ( comercio entre ))) or ((( comercio para ) OR ( comercio san )))))).
• Adding a wildcard symbol may retrieve word variants: (("comercio exterior") or ((((((("comercio intra") or ("comercio interno"))) or ("comercio entre"))) or ((("comercio para") OR ("comercio san"))))))*.