Perhaps you should try some spelling variations:
"coder coder classes allocation problem" » "coder coder class allocation problem" (Expand search), "coder coder asset allocation problem" (Expand search), "coder coder assets allocation problem" (Expand search), "coder coder classes location problem" (Expand search), "coder cover classes allocation problem" (Expand search), "coder lower classes allocation problem" (Expand search), "coder model classes allocation problem" (Expand search), "coder decoder classes allocation problem" (Expand search), "code code classes allocation problem" (Expand search), "decoder codec classes allocation problem" (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 classes allocation problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder classes allocation problem\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder classes allocation problem ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder classes allocation problem") OR ("on python python python programming"))*.