Search strings are joined via OR, should be joined via AND

Name search at civicrm/contact/search and via API at use master address splits the given string at blanks and joins them for query with OR.

former query (proposed):
"Office for Development" => WHERE name LIKE "%Office for Development%"

4.5.1 query (proposed):
"Office for Development" => WHERE name LIKE "%Office%" OR name LIKE "%for%" OR name LIKE "%Development%"

Joined via OR the result get's worse every time I'm trying to get more precise.

Work around from SYSTOPIA Organisationsberatung:
Replace blanks with underscore in the input.