SMART Search in drupal

hi there ,

A client complained to me that Drupal search is not smart enough .

"

ارض

" and "

أرض

" produces different results .

both words are read and pronounced the same and are the same words . (The UTF-8 codes for both words are different though)

أرض

ارض

An English letter Example can be

ê

and

e

;

any clues .?
Thanks