Hello saman.bidkani,
Thank you for using Apple Support Communities.
I see that your MacBook Air can't find your iPhone 5s and 6 via AirDrop. I use AirDrop to send files from my Mac to other devices as well, so I know it's important that we get this issue resolved. I have some tips that I would like to share with you.
Use the article Use AirDrop to send content from your Mac, specifically, this section:
If you don't see the recipient in the AirDrop window or sheet:
- Make sure that both devices have AirDrop turned on and are within 30 feet (9 meters) of each other.
- If you're sending to an iPhone, iPad, or iPod touch:
- Your Mac needs to be a 2012 or newer model with OS X Yosemite or later.
- The iOS device must be using iOS 7 or later and have Personal Hotspot turned off in Settings > Cellular.
Once you have confirmed these tips, please test again and see if you are able to find the devices.
If there's still an issue, I would advise to give all devices a fresh restart and test AirDrop again.
Best Regards.