Does anybody have idea to fix below problem? Thanks.
Your documents are added recently. In order to search them using search box you have to wait until they gets crawled in your environment.
Check below links for clarification:
Please try/check below things:
Re-indexing the all the content at the Search Service Application (Go to SSA > Index Reset under Crawling section) and then run a Full crawl. Then check the results.
Delete your content source and recreate this content source. You can refer to below article:
Disable the LoopBackRequest in registry. To do this, just follow below steps:
a. Go to command window and type regedit.exe.
b. Once opened the registry editor, just navigate to:
c. Right click on "Lsa" and create a new 32bit DWORD value.
d. Rename it as "DisableLoopbackCheck" (Note: you cannot rename it actually. so, once created the DWORD value, directly paste/type as "DisableLoopbackCheck".
e. Then again modify the value of "DisableLoopbackCheck" as "1".
f. Close the registry editor. Now start to a full crawl.
If above all do not work, check methods in below article: