Perhaps you should try some spelling variations:
"coder coding pid controllers complexity" » "coder coding pid control complexity" (Expand search), "modern coding pid controllers complexity" (Expand search), "color coding pid controllers complexity" (Expand search), "odor coding pid controllers complexity" (Expand search), "coder coding and controllers complexity" (Expand search), "coder coding in controllers complexity" (Expand search), "coder coding is controllers complexity" (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)

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 coding pid controllers complexity\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coding pid controllers complexity ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coding pid controllers complexity") OR ("api python python python programming"))*.