This is the 1469th most frequent Russian word.
любые
"Любые" means "any."
The word 'любые' is used here to indicate the universality or inclusiveness of 'problems,' meaning in this context 'any sort of problems' without exception.
Любые проблемы можно решить с терпением.
Any problems can be solved with patience.
Here, 'любые' is employed to refer to 'books' in the sense that the action (choosing) applies to any qualifying options, indicating freedom or openness in choice.
Вы можете выбрать любые интересующие вас книги.
You can choose any books that interest you.
The adjective 'любая' (feminine form of 'любые') is used here to emphasize the comprehensive offer of assistance, meaning all-encompassing within the defined conditions (help that is requested).