Perhaps you should try some spelling variations:
rptas » ptas, rtas, rpbas, rptask, rptaps, rpptas
rptask » ptask, rtask, rpbask, rptas, rptaskk, rptapsk, rpptask
ptask » task, ptas, ptaskk, ptapsk, pptask
peas » peaks, peak, seas
peaskk » peakskk, peakkk, seaskk
ras » rays
tas » task, taps, ptas

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((rptas or ((rptask OR ptask) or (peas or ras))) or peaskk) or tas) or ios)-ibg books series.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((rptas OR ((rptask OR ptask) OR (peas OR ras))) OR peaskk) OR tas) OR ios)-ibg books series..
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((rptas or ((rptask OR ptask) or (peas or ras))) or peaskk) or tas) or ios)-ibg books series.".
• Adding a wildcard symbol may retrieve word variants: ((((rptas or ((rptask OR ptask) or (peas or ras))) or peaskk) or tas) or ios)-ibg books series.*.