Perhaps you should try some spelling variations:
"coder coder controller tuning problem" » "coder coder controller in problem" (Expand search), "coder mode controller tuning problem" (Expand search), "coder order controller tuning problem" (Expand search), "coder power controller tuning problem" (Expand search), "coder coder controller using problem" (Expand search), "coder coder controller buying problem" (Expand search), "coder coder controller training problem" (Expand search), "coder decoder controller tuning problem" (Expand search), "code code controller tuning problem" (Expand search), "decoder codec controller tuning problem" (Expand search)
"api citons python python programming" » "api pitons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pythons python python programming" (Expand search), "api citons pythons python programming" (Expand search), "api citons piton python programming" (Expand search), "api citons pitons python programming" (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 controller tuning problem\") OR (\"api citons python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder controller tuning problem ) OR ( api citons python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder controller tuning problem") OR ("api citons python python programming"))*.