The "Contains" operator in Marketo can be tricky, and is not always forgiving.
Yet, if you're like a lot of companies (including mine) your job title standarization is not good, so the "contains" filter can be tempting.
One of the things to do is to use the "Starts" with filter. You can click on the plus sign and put "CTO" not the search box, from there look for common titles that appear beginning with "CTO" such as "CTO, Europe and Asia." Depending on how good or bad your standarization is, you can capture a wide swath by searching on "Starts with" CTO.
Looking more to the long term, if you're going to be generating a lot of lists based on job title, it is worth the investement of time to make sure that you clean up job titles of data you're importing either into Maketo and/or the CRM.