Are you saying this result should only return one document? If it's returning multiple documents, how would you expect the system to pick the right one to open? 

The documentation has an option you can use to open up a search if the result is only one entry. I have listed it below for you.

Here's some information from the LF Documentation:

You can also write your own repository search URL using the following syntax:

• http://servername/laserfiche/index.aspx?db=repositoryname#search=searchquery;view=search;imageenable=true
  • repositoryname = Laserfiche Repository
  • searchquery = Laserfiche search syntax
  • imageenable=true = Web Access will automatically open the imaged document if there is only one document returned in the search result.

SOURCE: http://www.laserfiche.com/support/webhelp/webaccess/9.1/en-us/WA/WebAccess.htm#SearchURLs.htm%3FTocPath%3DURLs%7C_____3