However matrix.itasoftware.com (which seems to be the backend for Google flights) gives you much more control over your search, albeit without a fancy user interface. Use the âAdvanced controlsâ link and enter âALLIANCE oneworldâ (ignore the quotes) to filter your search. You can manually select individual flights or let the engine select a complete itinerary.
It might even be possible to filter by oneworld airlines and exclude Malaysian. Check the help to work out how to use multiple controls.