Modify the cdh function to allow the user to specify a partial name of a directory in the history file preceded by a dash:

/etc: cdh –l
0 /users/pat
1 /tmp
2 /users/steve
3 /usr/spool/uucppublic
4 /usr/local/bin
5 /etc
/etc: cdh –pub
/usr/spool/uucppublic: cdh –bin
/usr/local/bin

The necessary code is added to the case statement just before the *) default case. Here's one way to add this feature, including an error message if there's no match found:
-[a-z]*) # find partial match in CDHIST
for dir in "${CDHIST[@]}"
do
if [ ! -z "$(echo $dir | grep "${1#-}")" ] ; then
# matched $dir, moving there
cdh $dir
return # done. uses first match
fi
done
echo "Error: No match for $1 found in CDHIST"
return ;;