I need help with extra string on URL ( ?vietnam%)

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Hi! I need help with the extra string on the following URLs:

[https://www.gameressential.com/?vietnam/2022-09-18903087.html])

The site was hacked previously and that URL was generated. I want to remove [?vietnam/2022-09-18903087.html]). Then I tried to redirect but no luck. Can you please help.

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