costum search module joomla

We are looking for somebody who can create a costum search module for a joomla site with K2 plugin or adapt the k2 filter module. We are developing a site which shows the possibilities for young people to go abroad. We need a search module which allows us to link a k2 item/joomla article to more than one search item. To give an example: one of the search possibilities should be duration of the project. The search module gives 4 options (less then 2 weeks, between 2 weeks and 3 months, between 3 months and 1 year, more than 1 year). We need to able to link an article to both less than 2 weeks as between 2 weeks and 3 months). K2 just allows us link the item with 1 of these. So, we need somebody who can write a module that allows us to link more search options on 1 article. Greetings, Rota Jovem