Perhaps you should try some spelling variations:
"coder decoder precoder scheme problem" » "coder encoder decoder scheme problem" (Expand search), "coder decoder codec scheme problem" (Expand search), "coder decoder precoding scheme problem" (Expand search), "coder decoder precoder science problem" (Expand search), "coder decoder precoder school problem" (Expand search), "coder decoder precoder same problem" (Expand search), "encoder decoder precoder scheme 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 decoder precoder scheme problem\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder decoder precoder scheme problem ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder decoder precoder scheme problem") OR ("api python python python programming"))*.