Search by User Defined Key

[armsys]

Is it possible to search a portion of a user defined key?
Say, a key is defined as "USC 1234". Is it possible to search "USC" while setting "Search only user-defined keywords" on? So far my partial user defined keyword search fails.

In "Advanced" mode, it seems the Search requires a pair of double quotes to enclose the character string to be searched. Is it true?

Thanks in advance.

Armstrong