"Yet over" is not a phrase with its own meaning.  It is likely to be a conjunction to a phrase which begins with "over".  Consider the following two sentences:

 Previously I did not like computers.    Over the years I have come to like them. 

You can join these two sentences using a number of conjunctions:

 Previously I did not like computers, yet over the years I have come to like them. 

 Previously I did not like computers, but over the years I have come to like them. 

 Previously I did not like computers, however over the years I have come to like them. 

 Previously I did not like computers, although over the years I have come to like them. 

You can see that "yet over" has no special meaning.

If this does not answer your question, you should provide the text that contains "yet over".  It is difficult to provide help without knowing the context in which words were used.