having problem in Searching mails

when i type something in search bar… and enter. it shows no mails are there for this search…as i have entered somemails subjected words then it also not done. 
in prev. version i was amazed with the search capabilities of emclient but now if i have to search then everytime i have to put filter like “to:cc:subject etc” otherwise it didn’t detect the mails. 
Kindly advise me how can i improve this.