Perhaps you should try some spelling variations:
"coder coder pid controllers problem" » "coder coder pid controllers profile" (Expand search), "coder coder pid control problem" (Expand search), "coder coder pid controllers project" (Expand search), "coder decoder pid controllers problem" (Expand search), "code code pid controllers problem" (Expand search), "decoder codec pid controllers problem" (Expand search), "coder order pid controllers problem" (Expand search), "coder encoders pid controllers problem" (Expand search)
"in python python python programming" » "in pythons python python programming" (Expand search), "in piton python python programming" (Expand search), "in pitons python python programming" (Expand search), "_ python python python programming" (Expand search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("coder coder pid controllers problem") OR ("in python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder pid controllers problem\") OR (\"in python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder coder pid controllers problem ) OR ( in python python python programming ))*.