Perhaps you should try some spelling variations:
"coder coder patterns open problems" » "coder cover patterns open problems" (Expand search), "coder border patterns open problems" (Expand search), "coder color patterns open problems" (Expand search), "coder coder patterns on problems" (Expand search), "coder coder patterns over problems" (Expand search), "coder coder patterns of problems" (Expand search), "coder decoder patterns open problems" (Expand search), "code code patterns open problems" (Expand search), "decoder codec patterns open problems" (Expand search)
"api pitons python python programming" » "api pitons pythons python programming" (Expand search), "api pitons piton python programming" (Expand search), "api pitons pytm python programming" (Expand search), "api citons python python programming" (Expand search), "api pitoni python python programming" (Expand search), "api pitoes python python programming" (Expand search)

You may be able to get more results by adjusting your search query.

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