Logic languages can deal with non-deterministic computations via built-in search facilities. However, standard search methods like global backtracking are often not sufficient and a source of many programming errors. Therefore, we propose the addition of a single primitive to logic-oriented languages to control non-deterministic computation steps. Based on this primitive, a number of different search strategies can be easily implemented. These search operators can be applied if the standard search facilities are not successful or to encapsulate search. The latter is important if logic programs interact with the (non-backtrackable) outside world.