Perhaps you should try some spelling variations:
"coder coder precoder allocation problem" » "coder coder power allocation problem" (Expand search), "coder coder precoder selection problem" (Expand search), "coder coder order allocation problem" (Expand search), "coder coder precoder location problem" (Expand search), "coder coder decoder allocation problem" (Expand search), "coder decoder precoder allocation problem" (Expand search), "code code precoder allocation problem" (Expand search), "decoder codec precoder allocation problem" (Expand search)
"and pythons python python programming" » "and pitons python python programming" (Expand search), "and piton python python programming" (Expand search), "and pythons piton python programming" (Expand search), "and pythons pitons python programming" (Expand search), "and pythons pytm python programming" (Expand search), "and python 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 precoder allocation problem\") OR (\"and pythons python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder precoder allocation problem ) OR ( and pythons python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder precoder allocation problem") OR ("and pythons python python programming"))*.