Perhaps you should try some spelling variations:
functions computation » function computation, functions composition, function composition
region segmentation » motion segmentation, brain segmentation, skin segmentation
methods discourse » methods course, methods disease, methods discrete
discourse based » course based
based agent » based agents

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((functions computation) or (region segmentation)) methods discourse based agent~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((functions computation) OR (region segmentation)) methods discourse based agent.
• Adding a wildcard symbol may retrieve word variants: ((functions computation) or (region segmentation)) methods discourse based agent*.