Perhaps you should try some spelling variations:
ptask » task, ptas, ptaskk, pptask
rptaskk » rtaskk, rptask, rptasks, rptasik, rptaskkk, rpptaskk
rmaps » maps, reaps
taps » maps, gaps, tape
rtaskk » rtask, rtasks, rtasik, rtaskkk, rptaskk
taskk » task, tasks, tasik, taskkk, ptaskk
tas » task, ptas

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

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