Perhaps you should try some spelling variations:
"coder _ python planning problem" » "coder _ python packing problem" (Expand search), "coder _ python planning process" (Expand search), "coder _ motion planning problem" (Expand search), "coder _ action planning problem" (Expand search), "coder _ option planning 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 _ python planning problem\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder _ python planning problem ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder _ python planning problem") OR ("api python python python programming"))*.