Perhaps you should try some spelling variations:
"coder coder qos constrained problems" » "coder coder qos constrained project" (Expand search), "coder coder qos constrained systems" (Expand search), "coder coder of constrained problems" (Expand search), "coder coder box constrained problems" (Expand search), "coder coder to constrained problems" (Expand search), "coder decoder qos constrained problems" (Expand search), "code code qos constrained problems" (Expand search), "decoder codec qos constrained problems" (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)

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 qos constrained problems") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder qos constrained problems\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder qos constrained problems ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder qos constrained problems") OR ("api python python python programming"))*.