Perhaps you should try some spelling variations:
"coder coder based obstacle problem" » "coder coder and obstacle problem" (Expand search), "coder decoder based obstacle problem" (Expand search), "code code based obstacle problem" (Expand search), "decoder codec based obstacle problem" (Expand search), "coder code based obstacle problem" (Expand search), "coder foder based obstacle problem" (Expand search), "coder codec based obstacle 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder based obstacle problem\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder based obstacle problem ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder based obstacle problem") OR ("api python python python programming"))*.