Perhaps you should try some spelling variations:
"covert feathers coverage linear function" » "covert feather coverage linear function" (Expand search), "covert feather covering linear function" (Expand search), "covert better coverage linear function" (Expand search), "covert feathers coverage liners function" (Expand search), "covert feathers coverage laser function" (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: (("covert feathers coverage linear function") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"covert feathers coverage linear function\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( covert feathers coverage linear function ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("covert feathers coverage linear function") OR ("api python python python programming"))*.