Perhaps you should try some spelling variations:
"coder coder ten string problems" » "coder coder ten string problem" (Expand search), "coder coder ten sharing problems" (Expand search), "coder coder ten sorting problems" (Expand search), "coder decoder ten string problems" (Expand search), "code code ten string problems" (Expand search), "decoder codec ten string problems" (Expand search), "coder coder in string problems" (Expand search), "coder over ten string problems" (Expand search), "coder under ten string problems" (Expand search)
"api pythons python python programming" » "api pitons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pythons piton python programming" (Expand search), "api pythons pitons python programming" (Expand search), "api pythons pytm python programming" (Expand search), "api 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 coder ten string problems") OR ("api pythons python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder ten string problems\") OR (\"api pythons python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder ten string problems ) OR ( api pythons python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder ten string problems") OR ("api pythons python python programming"))*.