Please confirm that the phrase you're searching on is actually

"Water Control Manual"

and not just

Water Control Manual

You will need to enclose the phrase in double quotes to search for that exactly when performing a standard text search. The behavior is a little different if you are doing a basic/quick search for Document Text. You can see how the search syntax is a little different if you have the "Advanced Search" enabled while you are doing the basic search for document text vs the standard text search.