Search using APP

When searching the iphone app for Monday I click into the board i want to search; click the magnifying glass to search then i type the work of number i want to search and nothing appears as an answer (I know that what I am searching has been entered into Monday) even though when i do the same search using a PC the search brings up results?? I work remotely and sometimes only have my phone to conduct business, this is really throwing my sales out as I cant search what I have sold and sell things multiple times, please give me instructions for searching using the Mobile App