This plugin allows you to search by Custom Fields value. Moreover, it is possible to search it for only the field that has been specified. "AND Search" and "OR Search" can be possible.
This plugin does not correspond to the "AND search" and the OR "search" by the notation that MT (since 4.2) has, nor does it correspond to the category filtering and the author filtering by the notation that MT (since 4.2) has.
Movable Type versions: 4.3