The question of a nanny is always difficult. However you can do some pre selection. Here is some info: (P.S I am not racist nor prejudiced however a mother with experience in nannies)
India - usually not intelligent and not too good in the cleaning department.English often poor
Phillipino - better in cleaning, talk a lot, usually want a lot of time off & have friends(boyfriends) which brings a whole different problem. English usually good, but want higher salary.
Indonesian - I have been lucky with them. Clean well,quite, do not want to go out, salary medium however not well educated and english maybe poor.
Thai, my favorite. Clean well, quite, medium salary and usually friendly. Like kids. Also most of them do massages!
English poor.

What you do is get a work permit for one of the nationalities you prefer, go to an agency and select from their list a nanny (get an older one who can cook, saw, has kids etc.) Bring her over. You pay this agency a fee & ticket. You then have a period to try out the maid. If you don't like her you can take her back to the agency. However discuss all these options with the agency first.
Good luck!

Aisha-Taweela