Perhaps you should try some spelling variations:
sejumlah studi » sekolah studi, sebuah studi, sejarah studi
ayah terhadap » anak terhadap, arab terhadap, agama terhadap
terhadap asas » terhadap azas, terhadap pasal, terhadap kasus
gaya alas » gayo alas, gaya ala, daya alam
data dan » fakta dan
hati a » hatim al, hati dan, hati doa
a data » 1 data, a date, dan data

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: (( hati a data dan gaya alas ) OR ( ayah terhadap asas sejumlah studi di ))~.
• Adding a wildcard symbol may retrieve word variants: (( hati a data dan gaya alas ) or ( ayah terhadap asas sejumlah studi di ))*.