IF CONTAINS OPERATORS IN AMPSCRIPT

At the top of my newsletter I bring salutation and last name information but I don't want to show the value in Salutation directly. I used below Amscript but apparently it only checks the first value then brings "mevrouw" regardlessly.

Geachte %%[ IF [Salutation] == 'De weledelgeleerde heer' OR 'De weledelzeergeleerde heer' OR 'De hooggeleerde heer' THEN ]%% heer %%[ ELSE ]%% mevrouw %%[ ENDIF ]%% %%Last Name%%,

Can we change this code something like this:

if salutation contains "heer" then bring "heer" else "mevrouw"

Thank you.