Perhaps you should try some spelling variations:
holography methods » holographic methods, tomography methods, mammography methods
biography methods » angiography methods, tomography methods, demography methods
ad federation » a federation, road federation, api federation

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "ad federation ((biography methods) OR (holography methods))*".