Dictionaries - Not enough words!

I have had this particular dictionary for at least 15 years, and I have finally reached the conclusion that it's not very helpful. It's a Viet-English, English-Viet book, but I've found that having both directions in one book makes the set of words included rather limited. Also it's copyrighted in 1975, so I'm sure there are new terms that are missing. I bought a Viet-English only book from Vinabook.com, and it is supposed to have 175,000 word/phrases. In truth, the way Vietnamese is used a lot of concepts are actually expressed using 2 words, so the V-E/E-V dictionary has definitions for the individual words but not so many phrases. I had to start using the V-E book recently because there were words in our 1st grade Vietnamese curriculum that I could not find in the other dictionary. 1st grade words! Not in the dictionary! Now I know I need to get an updated English-Vietnamese dictionary too.