It seems that for some classes (probably Chinese Instruments), there is a limitation of language used on the keyword to "Search Class No." under "New Enrolment" page.
For example, when the user is using the OES platform in English to enrol, nothing will be shown if the keyboard to "Search Class No." is "pipa" or "Pipa". Only "琵琶" works while the result shown is still in English.
Thanks for the concern.