Here's how you can enable recursive search for Nautilus in Ubuntu 14.04.
1. Open a terminal window.
2. Type in the following command then hit Enter.
gsettings set org.gnome.nautilus.preferences enable-interactive-search false
3. You can disable recursive search with this command.
gsettings set org.gnome.nautilus.preferences enable-interactive-search true
This time recursive search is replaced with type-ahead search in Ubuntu 14.04 Trusty. If you like that feature simply one command to enable/disable it.More at Noobs Lab
Additional Ubuntu Resources
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