Currently, the website is the 1st Google result of "aoe 2 tech tree" and the 3rd result in "age of empires 2 tech tree". However, searching in Simplified Chinese (keyword: "帝国时代2 科技树") does not include this website at all. This may also happen to the other languages.
Adding hreflang in html may help: Google docs https://developers.google.com/search/docs/advanced/crawling/localized-versions.
Currently, the website is the 1st Google result of "aoe 2 tech tree" and the 3rd result in "age of empires 2 tech tree". However, searching in Simplified Chinese (keyword: "帝国时代2 科技树") does not include this website at all. This may also happen to the other languages.
Adding
hreflangin html may help: Google docs https://developers.google.com/search/docs/advanced/crawling/localized-versions.