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Entering “vietuni” allows you to refine the search for Vietnamese terms, thanks to key keys adding tones - examples with the "e" key:
2 times: ê in combination with following keys to add tons: + "r" : ẻ + "s" : é + "f" : è + "j" : ẹ + "x" : ẽ + "w" : ẽ
It is possible to combine several tones - eg: "e" + "r" + "e" = ể
Using "w" - example with "o": "o" + "w" : ơ
