Hi Giu Tae Kim!
“If someone is interested I’ll try to explain the basics…”
Please do.
I know there are a couple of years ago but I hope you see that I respond and you still remember how you did. 🙂
I can the base in some of the coding, but most cut and paste until it works.
I have not really understood how I should begin. I mix of knowledge from the search form and WP_Query.
Grateful for answers.
Best wishes Elle