Perhaps you should try some spelling variations:
observation documentation » conservation documentation, information documentation, international documentation
creating documentation » generating documentation, teaching documentation, processing documentation
method precision » method decision, method prediction, methods decision
basic clustering » based clustering, bases clustering, music clustering
precision basic » decision basic, precision elastic, precision mass

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((observation documentation) OR (creating documentation)) method precision basic clustering~.
• Adding a wildcard symbol may retrieve word variants: ((observation documentation) or (creating documentation)) method precision basic clustering*.