Perhaps you should try some spelling variations:
"coder coder duration frequency modeling" » "coder coder duration frequency coupling" (Expand search), "coder coder duration frequency doubling" (Expand search), "coder coder duration frequency model" (Expand search), "coder power duration frequency modeling" (Expand search), "coder order duration frequency modeling" (Expand search), "coder longer duration frequency modeling" (Expand search), "coder decoder duration frequency modeling" (Expand search), "code code duration frequency modeling" (Expand search), "decoder codec duration frequency modeling" (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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("coder coder duration frequency modeling") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder duration frequency modeling\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder duration frequency modeling ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder duration frequency modeling") OR ("api python python python programming"))*.