Perhaps you should try some spelling variations:
based testing » based costing, based teaching, seed testing
testing ripe » testing real, testing ai, testing apps
ripe studies » case studies, ripe series
code act » code a, code ist, code mac
code ctu » code pt
code c » code _, code 2, code a

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 act) or (code c))) or (code ctu)) based testing ripe studies.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: commercial ((((code act) OR (code c))) OR (code ctu)) based testing ripe studies..
• Adding a wildcard symbol may retrieve word variants: commercial ((((code act) or (code c))) or (code ctu)) based testing ripe studies.*.