Perhaps you should try some spelling variations:
materi belajar » teori belajar, seri belajar, strategi belajar
tanpa bahaya » tanpa cahaya, tanpa bahan, tanpa budaya
mari belajar » hasil belajar
belajar di » belajar dan
wahid dan » tauhid dan, wahid al, wahid dkk
di wahid » din wahid, mi wahid, dien wahid

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: (( materi belajar ((tanpa bahaya) OR (tanpa biaya)) dan 19 ) OR ( mari belajar di wahid dan _ ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( materi belajar ((tanpa bahaya) OR (tanpa biaya)) dan 19 ) or ( mari belajar di wahid dan _ ))~".
• Adding a wildcard symbol may retrieve word variants: (( materi belajar ((tanpa bahaya) OR (tanpa biaya)) dan 19 ) or ( mari belajar di wahid dan _ ))*.