People who enter names with accented characters have the keyboards set to do that. If using a search query, this is cumbersome, but you can use:
WHERE(
REPLACE('string', 'fancy letter', 'simple equivalent') = "Fernano"
)
Or you could develop a map between accented and non-accented characters:
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
'STRING',
'fancy1', 'simple1'),
'fancy2', 'simple2'),
..
..
..
..
'fancy6', 'simple6')
Here's a URL for ASCII characters:
http://samuelfullman.com/team/html/ascii.htm
-- or you could use regular expressions!!!
And I suggest you do these conversions in PHP vs. using the example above.
Sam Fullman