Yes. you can.
Study by yourself with ISTQB Syllabus, glossary and other materials.

However, without training, it will be tough to get a certification.
so, we strongly recommend all of exam takers to take a training course in advance.

I'm making a money to take a course, however, just in case, I would like to
know. 

Is there any seminar for self-study guideline? .....

Yes. There is a "Self-Study Guideline Seminar".
If you are interested, then, please contact to training@vietnamesetestingboard.org.
But, you must be a group to hold a seminar.

topics will be

-Guideline for study own of ISTQB certification
-Brief introduction of ISTQB foundation Syllabus
-How to use a ISTQB glossary as a dictionary.
-Reference material
-Exam composition.
-General process of Exam.

It's a good idea to form a group for selfStudy. I prepare for this long time a go but still feeling not confident to take the exam.

Can you be prime to form a selfstudy group?

I think many tester want to join that selfstudy group. It's useful to create a group to discuss together.

Agree, I also want to join with duyhuynh and hung_chu
Whenever you create selfstudy group, pls call me 🙂

First, recommend to take a sample exam first to see the structure to exam.

http://www.vietnamesetestingboard.org/zbxe/?mid=sampleexamseminar

In the seminar, we'll discuss how to selfstudy.

I want to join, too. It's good to have a free exam like this but I can't go to HCM for it. 🙁
If there were in Hanoi, it would be nice opportunities for me and other testers in Hanoi. 🙂

However, when self-study group establishes, let me register together! Thank you!

We are planning to have a sample exam In Hanoi too. As soon as it's decided, we'll notice.

I wouldn't recommend it