Lonely Planet Vietnam is a comprehensive travel guide that provides all the basic information a traveler would need for traveling in Vietnam. Be it information on the history, lodgings, transport, food or places of interest, you can find it in the book. Of course, other Vietnam travel guides are just as good. It is just a personal preference that I stick to Lonely Planet.
For information on motorcycling in Vietnam and the Russian Minsk motorcycle, you can refer to the very excellent website MinskClub Vietnam. You can even find a soft copy of the Minsk manual on their site.