Perhaps you should try some spelling variations:
based representation » based presentation, self representation, data representation
representation pt » representation et, representation part, representation _
code earth » code search
pt studies » pet studies, past studies, patt studies
one earth » one part, one birth, one party
one heart » one health, one year, one part

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

• Performing a fuzzy search may retrieve terms with similar spellings: commercial ((code earth) or (((one earth) or (one heart)))) based representation pt studies.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: commercial ((code earth) OR (((one earth) OR (one heart)))) based representation pt studies..
• Adding a wildcard symbol may retrieve word variants: commercial ((code earth) or (((one earth) or (one heart)))) based representation pt studies.*.