Can vostro V131 run 2 external usb3.0 HDD ?

Could someone confirm with me that V131 can run two external usb3.0 HDD or not, please ? I have to deal with vostro 3750 by usb 3.0 hub (which is I cant find).
The vostro 3750 has two usb3.0 ports (blue color) but they just can’t run two external usb3.0 HDD at the same time.
Accept: (2.5” usb3.0 + 2.5” usb2.0); (2.5” usb3.0 + 3.5” usb2.0); (3.5” usb3.0 + 2.5” usb2.0); (3.5” usb3.0 + 3.5” usb3.0 – haven’t tested)
Non-accept: (2.5” usb3.0 + 2.5” usb3.0); (2.5” usb3.0 + 3.5” usb3.0)
Note: 3.5” hdd with adapter
So what is the point of the laptop having 2 usb3.0 ports ? for show off, look cool ???!!
I have confirm from Dell’s technician that vostro 3750 can’t run with 2 ext usb3.0 so I guess votro 3350, 3450, 3550, and especially V131 can not run also.
I have tested 2 ext 2.5” usb3.0 HDD with Dell XPS 15 (L501X), they run perfectly.
Answer #1
I surmise there isn’t enough power via USB port to run both. But if there’s something less power hungry (like a pen-drive) then it should be able to run them both at USB3 speeds.
Answer #2
You should try using a USB 3 powered hub for one of the drives.