You can create keyword search campaign at https://cpidroid.com/campaign/install/add.php?platform=android by selecting "Search / Keyword Campaign" option in Campaign Type field.
After that, you will be asked to enter Keyword Sets that you want to target then fill rest of the form as usual.
Note: Enter keywords here which show the promoted app within the first 100 search results in any targeted country.
Note: If you have multiple keyword sets, separate them by a semicolon (;). They will be delivered equally among users.
Note: Only target countries which find the app for the same keyword sets - otherwise create multiple campaigns for different regions.