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This thread is resolved. Here is a description of the problem and solution.
Problem: When I search for a parent (that's important) location in any secondary languages from the home page, the results list is always empty. But it works well if I choose a child location.
Solution: The developer from the "Book your Travel" Theme provided a patch that fixed the problem. If you struggle with the same issue, please contact the Theme author.
Relevant Documentation: https://themeforest.net/item/book-your-travel-online-booking-wordpress-theme/5632266