If you want to look for a specific change in an area of a file you are working on or even the whole file, This can be done with fugitive, a vim plugin for git, which makes it extremely useful.
To do this you need to use the
Glog command, it will search for all changes on the file and set it up in your quickfix list.
To move from change to change, the plugin
unimpaired.vim adds some default key binds that are very useful
|[q||:cprev||Jump to previous quickfix item|
|]q||:cnext||Jump to next quickfix item|
|[Q||:cfirst||Jump to first quickfix item|
|]Q||:clast||Jump to last quickfix item|
For more information look here