Where I taught English, this was the dictionary the Teaching Assistants used for reference.
I started using it myself and found it’s pretty thorough and most of the time has examples of the word in different contexts. I actually think it’s better than my dictionary in book form!
Here’s an example:
Many words also have an audio file so you can hear the pronunciation, with a northern accent of course.
It has multi-lingual dictionary features currently: English↔Vietnamese, Vietnamese-Vietnamese, French↔Vietnamese and Chinese→Vietnamese.
Over to you: Have you used Vdict.com? Do you have any other dictionary recommendations? Tell us in the comments.