Perhaps you should try some spelling variations:
"mari belajar dan surat sosial dini" » "hasil belajar dan surat sosial dini", "mari belajar dan strata sosial dini", "mari belajar dan surat sosial edisi", "mari belajar dan surat sosial dan", "mari belajar dan surat sosial di", "mari belajar dan barat sosial dini"
"seri belajar al angka usia dini" » "teori belajar al angka usia dini", "cara belajar al angka usia dini", "seri belajar di angka usia dini", "seri belajar anak angka usia dini", "seri belajar mata angka usia dini", "seri belajar al anak usia dini", "seri belajar a angka usia dini", "seri belajar dan angka usia dini", "seri belajar 1 angka usia dini"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("seri belajar al angka usia dini") or ("mari belajar dan surat sosial dini"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("seri belajar al angka usia dini") OR ("mari belajar dan surat sosial dini")).
• Removing quotes may allow a broader search: (( seri belajar al angka usia dini ) or ( mari belajar dan surat sosial dini )).
• Adding a wildcard symbol may retrieve word variants: (("seri belajar al angka usia dini") or ("mari belajar dan surat sosial dini"))*.