Perhaps you should try some spelling variations:
persistence problems » persistence problem (Expand search), resistance problems (Expand search), resistance problem (Expand search)
data persistence » and persistence (Expand search), lactase persistence (Expand search), local persistence (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
coder coder » coder decoder (Expand search), code code (Expand search), decoder codec (Expand search)
coder data » cover data (Expand search), code data (Expand search), border data (Expand search)
on python » in python (Expand search), of python (Expand search), _ python (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( coder coder data persistence problems ) OR ( on python python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( coder coder data persistence problems ) OR ( on python python python programming ))*.