Perhaps you should try some spelling variations:
"coder coder based costing problems" » "coder coder based couting problems" (Expand search), "coder coder based counting problems" (Expand search), "coder coder based routing problems" (Expand search), "coder decoder based costing problems" (Expand search), "code code based costing problems" (Expand search), "decoder codec based costing problems" (Expand search), "coder code based costing problems" (Expand search), "coder foder based costing problems" (Expand search), "coder codec based costing problems" (Expand search)
"on python python python programming" » "on pythons python python programming" (Expand search), "on piton python python programming" (Expand search), "on pitons python python programming" (Expand search), "in python pythin python programming" (Expand search), "of python pythof python programming" (Expand search), "_ python pyth_ 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 based costing problems") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder based costing problems\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder based costing problems ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder based costing problems") OR ("on python python python programming"))*.