@Shi The video on advanced search that @Frank_S suggested is excellent. His suggestion to try the search in your qlik sense app is spot on also. Here is an example that I ran into myself. The Beginner's Tutorial app has filters on the Dashboard page for field Year, Quarter, Month etc. The field in the app is Date. So I thought in NPrinting I could create a filter looking for specific years. That app was using autocalendar and when I selected a year in the qlik sense app you could see in the field name in the selections at the top Date.autoCalendar.Year.
If I entered < 2013 in the search bar for the Year filter I did not see any results show up but when I entered
< 01/01/2013 then the year 2012 would appear.
So when I wanted to create a search filter expression in NPrinting - I first tried it out in the search bar on my qlik sense app.
In NPrinting, I wanted to get the year 2013 only so I entered this expression for the advanced search filter
>12/31/2012<1/1/2014 and it worked.
Another tip is to look in your data model to see how your field is defined - is it numeric, text etc