Thank you for contacting Ancestry. Unfortunately, our search index for the family trees hasn't updated since the end of November. I am unsure if you have uploaded your tree as a new tree, changed the tree name, or added the people that you are searching for since that time, but if you have done any of these things since November 24th of last year, this would be why your tree isn't showing up on a search. Typically our search index for the trees updates about once every two to four weeks, but there have been some issues with this update going through properly the last couple of time that it did go through, so our developers are currently working on this issue and hope to have the updating process going again soon. Until then, the only way for others to get onto your tree is for you to send them invitations to the tree. Ancestry.com.