Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
madan practical » made practical, japan practical, man practical
patrick madan » patrick haldane, patrick modiano, patrick maxton

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

• Adding a wildcard symbol may retrieve word variants: the patrick madan practical astronomy series*.