q/ 1 site for 1 language or all languages in just 1 website?

HI

i wanted to create some parasites on sites.google.com/view

I want to create some 3 4 pages for each keyword in all of languages , but imnot sure that I should create a single website for each of keywords in each languages or I can combine of all them in just one website ?

or at least the language are same like Bulgarian and Russian in 1 website

what should I do ?

You can go for a multisite setup where each language is an extension on the website, like website.com/en website.com/de and so on.. That's usually how you build an authority site and don't have to promote 1000 different websites.