Perhaps you should try some spelling variations:
"coder precoder reference center problem" » "coder barcode reference center problem" (Expand search), "coder precos referente center problem" (Expand search), "coder barcodes reference center problem" (Expand search), "coder decoder reference center 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.

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