Recently having problems with the search function as the box seems somehow misaligned using Safari on my laptop.  Not sure if it's the same on other browsers as I haven't tried yet.  Unless you use the advanced options it makes searching very difficult.  Basically, when you click the search box the cursor is placed over the selection box to the left (where you'd normally select where you want to search) and your input overwrites the search option selector.  Clicking that selector then does nothing.

It is the same on the Chrome browser.

Sent from my Nexus 5X using Thaivisa Connect mobile app