Hi kamhang,
Thank you for your purchase.

Please provide me a temporary WP-admin login for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course we do not provide login data to third party. You can write credentials here just check Private Reply so nobody can see them except us.

Hi kamhang

You can use OR instead of AND if you want to add more keys. Can you try with this query 

WHERE 1=1 
  AND posts_relic.post_type = 'relic'
  AND (posts_relic_custom_fields.meta_key = 'aaaa'
  OR posts_relic_custom_fields.meta_key = 'bbbb'
  OR posts_relic_custom_fields.meta_key = 'cccc')

Please note that writing query one are not covered in the included support for the plugin. Included support covers help with bugs and general inquiries for the plugin features. I can give you some guide but I can not write custom code for you.

Thank you for understanding.

Hi kamhang,

I really want to help you but as I mentioned writing query are not covered in the included support for the plugin. 
I did my best to give you some suggestions and hints but I hope you can understand our policy and rules that we can not break because it wouldn't be fair for other clients that are asking for same issues ( in this example writing queries).

Thank you for your understanding.