Why can't I detect any wireless device using wifite in kali linux

I'm trying to pentest the wireless network in my dormitory. I have a USB wireless adapter connected to my kali. As you can see, I can't detect any wifi network even I know there are many wifis here. Here is my code :

root@kali:~# iwconfig
lo        no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off

eth0      no wireless extensions.

root@kali:~# airmon-ng start wlan0

Found 2 processes that could cause trouble.
If airodump-ng, aireplay-ng or airtun-ng stops working after
a short period of time, you may want to run 'airmon-ng check kill'

  PID Name
  609 NetworkManager
  788 wpa_supplicant

PHY Interface   Driver      Chipset

phy0    wlan0       rt2800usb   Ralink Technology, Corp. RT2870/RT3070

        (mac80211 monitor mode vif enabled for [phy0]wlan0 on [phy0]wlan0mon)
        (mac80211 station mode vif disabled for [phy0]wlan0)


root@kali:~# airodump-ng wlan0
Interface wlan0: 
ioctl(SIOCGIFINDEX) failed: No such device
root@kali:~# airodump-ng mon0
Interface mon0: 
ioctl(SIOCGIFINDEX) failed: No such device
root@kali:~# 
root@kali:~# airmon-ng check kill

Killing these processes:

  PID Name
  788 wpa_supplicant

root@kali:~# 
root@kali:~# air
airbase-ng              airdecap-ng             aireplay-ng             airodump-ng             airolib-ng              airtun-ng
aircrack-ng             airdecloak-ng           airmon-ng               airodump-ng-oui-update  airserv-ng              
root@kali:~# airmon-ng start wlan0

Found 2 processes that could cause trouble.
If airodump-ng, aireplay-ng or airtun-ng stops working after
a short period of time, you may want to run 'airmon-ng check kill'

  PID Name
 2209 dhclient
 2287 NetworkManager

PHY Interface   Driver      Chipset

phy0    wlan0mon    rt2800usb   Ralink Technology, Corp. RT2870/RT3070

root@kali:~# airodump-ng wlan0mon

note : 
do not use airmon-ng to enable monitor mode because it stop the network-manager service
Instead, use :
ifconfig wlan0 down
iwconfig wlan0 mode monitor;
ifconfig wlan0 up;

 CH 14 ][ Elapsed: 56 s ][ 2017-03-23 07:32                                         

 BSSID              PWR  Beacons    #Data, #/s  CH  MB   ENC  CIPHER AUTH ESSID


 BSSID              STATION            PWR   Rate    Lost    Frames  Probe                                                                                   


root@kali:~# 

You see I've been waiting for 56 seconds and I still didn't get a target scanned. I've also tries many times and waited longer, still the same. I don't know where is wrong. Please help.