Perhaps you should try some spelling variations:
mari belajar » hasil belajar
seri belajar » teori belajar, cara belajar
anak sahabat » antar sahabat, anak shalat, atau sahabat
sahabat yang » sahabat nabi, sahabat anak
dan raja » dan remaja, sang raja
aba aba » abal abal, aba baca, abas abu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( seri belajar ((aba aba) OR (laba laba)) dan raja ) OR ( mari belajar anak sahabat yang _ ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( seri belajar ((aba aba) OR (laba laba)) dan raja ) or ( mari belajar anak sahabat yang _ ))~".
• Adding a wildcard symbol may retrieve word variants: (( seri belajar ((aba aba) OR (laba laba)) dan raja ) or ( mari belajar anak sahabat yang _ ))*.