Perhaps you should try some spelling variations:
information preservation » information presentation, information representation, information generation
preservation first » preservation fast, preservation from, preservation must
first decision » first division, first revision, first session
based grouping » based cropping, blood grouping, based group
data guoqing » data getting, data coding
_ grouping » _ growing

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

• Performing a fuzzy search may retrieve terms with similar spellings: information preservation first decision ((((based grouping) or (data guoqing))) or (_ grouping))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information preservation first decision ((((based grouping) OR (data guoqing))) OR (_ grouping)).
• Adding a wildcard symbol may retrieve word variants: information preservation first decision ((((based grouping) or (data guoqing))) or (_ grouping))*.