Perhaps you should try some spelling variations:
"water automatic classication" » "water automatic classifcation", "water automatic classification", "water automatic classificaton", "rate automatic classication", "paper automatic classication", "water automated classication"
"water automatic association" » "water automatic dissociation", "water automating associations", "water automatic annotation", "rate automatic association", "paper automatic association", "water automated association"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"water automatic association\") OR (\"water automatic classication\"))".
• Removing quotes may allow a broader search: (( water automatic association ) OR ( water automatic classication )).
• Adding a wildcard symbol may retrieve word variants: (("water automatic association") OR ("water automatic classication"))*.