How to construct my query string in SearchRequest object?

[Boti2003]

I would like to make searches in the SpotifyAPI-NET, so I use the Search.Item(new SearchRequest(Types type, string query)) function.
It is working to some points, but I simply couldn't figure out how to contsruct the query string to set the limit and offset value, or even how to make to query field work simoultaneously (for example it's working with years and artist separated with comma, but not working with year and genre). I am getting tired of these random problems, and I couldn't find anywhere else informations about the order or the rules of constructing the string. I would be really glad, if someone could help me out with this:)))

Thank you very much in advance!!