After reading some novels set in Southeast Asia, I became really curious about the region - I know basically nothing of the history. This book is a great summary of the region's history, grouped together by topic rather than a strictly linear narrative.
The history is pretty gripping - this is a region where you really did have big simultaneous interactions between people from Europe, India, China, and Southeast Asia. And, if you include the trade via Mexico, peoples from America too! The 1500s - early 1700s were pretty much the peak time here.
The book emphasizes the uniqueness of Vietnam as distinct from the rest of the region, mainly due to the very direct influence of China. China's influence was seen elsewhere as well, but the land border made a big difference. Still, even Vietnam is much more pluralistic than I had realized.
The exchange of rice technologies was a major influence in the region, causing huge population gains and movement of population from the highlands to the lowlands. This triggered increase in trade and, interestingly, importing of Chinese settlers as skilled laborers. India is a fascinating comparison. They didn't settle so much as visited as traders who primarily returned home. But even in this case there was a tradition of taking local "wives" who were culturally the ones who handled all the money.
I only skimmed the 1800s - to present because it isn't really the era of history I'm curious about.