Autocomplete widget doesn't yield the search results

I have the following code on an HTML form...

<tr><td valign="top"><b>Traitement ou Procédure</b><br/>(Treatment or Procedure)</td> <td colspan="3"><obs conceptId="6193" answerClasses="Procedure" style="autocomplete" labelText="1" size="80"/><br/>

I have the following concepts, some of which are procedures...
CAST SPICA
CAST LONG LEG
CAST LONG ARM
CAST SHORT ARM
CAST SHORT LEG
CAST REDUCTION ⇒ CLOSED REDUCTION
CAST LEG SPLINT ⇒ CAST - LEG SPLINT ONLY
CAST CLAVICULAR ⇒ CAST - CLAVICULAR "FIGURE OF 8"
CAST - ARM SPLINT ONLY
CASTOR OIL

In the HTML form, if I search for "CAST", I don't get any results. If I search for "LEG", it will yield "CAST LONG LEG", "CAST SHORT LEG", "CAST LEFT SPLINT" among others. I get similar results if I search for "ARM".

This happens with HTML Form Entry 1.7.3 on OpenMRS Version: 1.8.2 Build 21762.