Perhaps you should try some spelling variations:
"coder coding of navigation problem" » "coder coding of estimation problem" (Expand search), "coder coding _ navigation problem" (Expand search), "coder coding and navigation problem" (Expand search), "coder coding robot navigation problem" (Expand search), "modern coding of navigation problem" (Expand search), "color coding of navigation problem" (Expand search), "odor coding of navigation problem" (Expand search), "coder bonding of navigation 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)

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