But 'ItemSchema.Body' Searchfilter doesn't work well in Searchfolder.
SearchFilter on the Body are very expensive in performance terms, searchfolder generally back-fill so it maybe after a period of time you search folder will work but it depends on the complexity of the search your trying to do.
I already checked that I can not use AQS in SearchFolder. also I cannot use Traversal Deep option which retrive subfolders in ordinary Searchfilter.
Instead of using a SearchFolder why not just make a live query using AQS as this uses the content indexes these query will generally return in an acceptable amount of time.