How i18n specify the language for search?

Hi,

I need to retrieve a search from services module, using the search.nodes method, but the service only returns the results written with the main languages.

With the site default search, i can see my translated nodes when i change the language flag, but with service no.

so...how does i18n module makes it possible?
how to search at the specifiec language? can pass it as argument?

i tried to understand the code behind search module and search service but i still can't understant it very well.

i don't know how to implement the search hook to respect the language, as when you use the site normally.
(making it more clear: i can find my nodes with i18n trough search module, but not with search service)

at search-service.inc there is a call to:
$results = module_invoke('node', 'search', 'search', $keys);

but in node.module, there is
function node_search($op = 'search', $keys = NULL) { [...] and there in the case 'search' , the actual search is being made, but i don't know where at the code the i18n affects.

i can't see the difference between the search made trougth search module (normal search form from site) and the search made with services.

any tip?

thanks in advance.