How to use Search Bar input include input from Keyword by text in Custom Fields

Hi,
sorry but i do not really understand what you would like to do, can you explain it a bit more clearly? Thanks.

How to use Fields – Search Form to input Keyword …
I do a search through the keyword. I can’t find the fields I posted, how do I fix them?

Custom Fields >> “name” => “advert_idline”

https://www.picz.in.th/image/AqJkO8
https://www.picz.in.th/image/AqJh3z

Hi,
the keyword field will look in the Ad titles and description only, if you would like it to search some custom fields as well then this will require some custom programming.

You can find few suggestions on how to do that here https://wordpress.stackexchange.com/questions/35864/how-to-make-search-include-data-from-wp-postmeta, i think it is best to start with the Relevanssi plugin although i am not familiar with it so i cannot tell if this is a correct direction and/or with the answer with 7 and 6 votes (the one with 11 votes seems to incorrect).