Perhaps you should try some spelling variations:
"closed string mining algorithms complexity" » "closed string mining algorithmic complexity" (Expand search), "closed string learning algorithms complexity" (Expand search), "closed string routing algorithms complexity" (Expand search), "closed strings mining algorithms complexity" (Expand search), "closest string mining algorithms complexity" (Expand search), "closed springs mining algorithms complexity" (Expand search), "closed string winding algorithms complexity" (Expand search), "closed strip mining algorithms complexity" (Expand search), "closed during mining algorithms complexity" (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: (("closed string mining algorithms complexity") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"closed string mining algorithms complexity\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( closed string mining algorithms complexity ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("closed string mining algorithms complexity") OR ("api python python python programming"))*.