Perhaps you should try some spelling variations:
surat sosial » strata sosial, ayat sosial, surat massal
seri belajar » teori belajar, mari belajar, cara belajar
belajar dan » belajar anak, belajar mata
sosial dini » sosial edisi, sosial dan, sosial di
ipa jejak » ii jejak
dan surat » dan barat, dan sunah
i jejak » ii jejak, 1 jejak, di jetak

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 ((ipa jejak) OR (i jejak)) usia dini ) OR ( seri belajar dan surat sosial dini ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( seri belajar ((ipa jejak) OR (i jejak)) usia dini ) or ( seri belajar dan surat sosial dini ))~".
• Adding a wildcard symbol may retrieve word variants: (( seri belajar ((ipa jejak) OR (i jejak)) usia dini ) or ( seri belajar dan surat sosial dini ))*.