Deanship of E-Learning and Distance Education;
King Abdul-Aziz University;
Jeddah;
KSA;
Math & Computer Science Department;
Faculty of Science;
Azhar University;
Cairo;
Egypt;
Massive; Open; Online; Courses; MOOCs; Search; Engine; Hypermedia; Systems; Web-Based; Services; Query; Expansion; Probabilistic; Model; Information; Retrieval;