Perhaps you should try some spelling variations:
based representation » based presentation, self representation, data representation
representation space » representation series, representation de, representation a
space studies » scale studies, peace studies, race studies
code search » model search, mode research, force search
code earth » one earth
done part » one part, come part

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

• If you are trying to use Boolean operators, they must be ALL CAPS: commercial ((((code earth) OR (code search))) OR (done part)) based representation space studies.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "commercial ((((code earth) OR (code search))) or (done part)) based representation space studies.~".
• Adding a wildcard symbol may retrieve word variants: commercial ((((code earth) OR (code search))) or (done part)) based representation space studies.*.