LingvoSoft Dictionary Free English Vietnamese for Windows is a free software with a 12,000 word database which has similar functionalities to its paid versions.

If you're on a budget, LingvoSoft Dictionary Free English-Vietnamese for Windows is a great option. It may have a lighter word database (12,000 words and phrases), but it has all of the same functional aspects as the commercial versions. And best of all, it's completely free to register.
The LingvoSoft Dictionary Free English-Vietnamese for Windows has a variety of helpful functions, including instant direct translation and back translation of words, instant translation of expressions containing several words, and a word list that lets you look through all the entries in alphabetical order.
But that's not all – this software also offers multiple translations for the selected word, quick back translation for proof of correct understanding, and a quick search function. Additionally, the application stores selected words in the filtered list for easy repeat access, and you can search the whole dictionary by entering only a part of the word or a short letter combination.
You'll also appreciate the fact that the software is supported in several languages and includes a helpful user manual and a "What's New" section in English. Overall, LingvoSoft's line of English-Vietnamese dictionaries for Windows is an excellent choice for anyone who needs accurate translations and an easy-to-use interface.
Version 2.1.28: N/A