Perhaps you should try some spelling variations:
"coder coder signal control problem" » "coder coder signal control problems" (Expand search), "coder coder signal control program" (Expand search), "coder coder digital control problem" (Expand search), "coder mode signal control problem" (Expand search), "coder power signal control problem" (Expand search), "coder power signals control problem" (Expand search), "coder decoder signal control problem" (Expand search), "code code signal control problem" (Expand search), "decoder codec signal control problem" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons python python programming" (Expand search), "rpa python python python programming" (Expand search), "manim 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 signal control problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder signal control problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder signal control problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder signal control problem") OR ("api python python python programming"))*.