You can't play golf in Vietnam without a caddie — and every single one of ours was female. Their English varied from caddie to caddie, but my first caddie had the best of the lot, and we had a lot of laughs out on the course together. Ours even shared their lunch with us while riding on the back of the cart, whether that was watermelon or some interesting local Vietnamese food.
They had some great sayings. Whenever you hit one into the rough, or near out of bounds, the standard line was "how good is that?" — usually followed by something like "fifty-fifty" on your chances of finding it. They genuinely knew the course and gave good advice on where to hit it, and just as importantly, where not to.
Not everyone in the group warmed to having a caddie. A couple of the boys had never played with one before and weren't quite sure how to get the most out of the experience — it takes a bit of getting used to.
These women work hard for not much money — only around $25 NZD a day — so tipping properly matters. We were advised to give around $34 NZD per round. They'd have a club ready for you before you even asked, and if it wasn't the right one, you'd see them sprinting back to the cart — or yelling at a fellow caddie — to get the correct club.
We took our own towels for the caddies to prepare for us in the cart's ice buckets — it genuinely pays to do this, as it gets extremely hot out there. Make sure you fill your bag with water beforehand too. It's much cheaper to buy before you get to the course rather than on it — on course, coke runs about $4 NZD a can and water around $2.50.
It's worth remembering the caddies are there to help you enjoy your day, not just to keep score. It's about looking up, smelling the roses, and having fun out there, even if the golf is tough.