SharePoint Search does not work

Kelly_Edinger 

Thank you for your answer, but the length of the file isn't the problem. And, also, yes, I am using the Title column and it has same text.

Here is another (simple) example:

I have 4 documents in my test doc lib with metadata column called "aaa":

So, if I search fro term "77", I get nothing.

If I search "77*", I get only 1 file.

I can't get file with metadata "p77940", unless I start with "p77*"

Another example:

If I write "52" as a search term - I get NOTHING.

If I write "52*" as a search term - I get NOTHING.

But, when I write "852*" - i get the file.

So, this means that SP search uses "startsWith" function for searching??

How can I search the middle of the word??