Perhaps you should try some spelling variations:
"river revetment analysis." » "river investment analysis.", "river movement analysis.", "river pavement analysis.", "river development analysis."
"five elements analysis." » "five plants analysis.", "like elements analysis.", "finite elements analysis.", "core elements analysis."
"river element analysis." » "river sediment analysis.", "linear element analysis.", "rubber element analysis."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("river element analysis.") OR ("river revetment analysis."))) or ("five elements analysis."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("river element analysis.") OR ("river revetment analysis."))) OR ("five elements analysis."))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"river element analysis.\") OR (\"river revetment analysis.\"))) or (\"five elements analysis.\"))*".
• Removing quotes may allow a broader search: (((( river element analysis. ) OR ( river revetment analysis. ))) or ( five elements analysis. ))*.