Perhaps you should try some spelling variations:
"coder coder dose optimisation problems" » "coder coder dose optimization problems" (Expand search), "coder coder dose optimization problem" (Expand search), "coder coder dose optimization process" (Expand search), "coder coder cost optimisation problems" (Expand search), "coder coder based optimisation problems" (Expand search), "coder decoder dose optimisation problems" (Expand search), "code code dose optimisation problems" (Expand search), "decoder codec dose optimisation problems" (Expand search), "coder codes jose optimisation problems" (Expand search), "coder powder doses optimisation problems" (Expand search), "coder copper doses optimisation problems" (Expand search)
"_ python python python programming" » "_ pythons python python programming" (Expand search), "_ piton python python programming" (Expand search), "_ pitons 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 dose optimisation problems") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder dose optimisation problems\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder dose optimisation problems ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder dose optimisation problems") OR ("_ python python python programming"))*.