Items on Hip will appear on search using the default sort order, "Best Match". This view generally takes various factors such as when your items were put up for listing, item price, page views, location, and other considerations into account to show buyers the most relevant search results.
Buyers may also apply different filters and sort orders from the list of options at the top of the page. These sort orders include sorting them according to their price, when they were listed, when they will end, and according to their page views.
If you are unable to see your listings on Hip, these sort filters might be the reason why.
For more information about how to search Hip, see the below articles: