IMHO

Ilmu and pengetahuan both mean knowledge, but the former can also be translated as wisdom.

Google references are shown as samples of the usage.

Unearth knowledge

Underpinning Cherwitz' work is his belief that academics, especially those in disciplines such as communication, have an ethical obligation both to discover and put knowledge to work—-to UNEARTH KNOWLEDGE uniting theory, practice and production.
http://en.wikipedia.org/wiki/Richard_Cherwitz

Through the model of the ‘three-legged stool’ activists hope to ‘give voice’ to women prisoners and ground their own knowledge of the ills of prison life in the experience of those who suffer its effects in everyday life. In this sense,activists provide women prisoners a forum to UNEARTH KNOWLEDGE counter to mass media representations of life behind bars and the opportunity to redefine themselves by resisting the criminal labels acquired through the justice system.
http://fty.sagepub.com/cgi/reprint/8/3/299.pdf


He had always felt that it was his mission to UNEARTH KNOWLEDGE that had been driven underground by interested parties, and in Thrones his dedication to this task was coupled with a more emphatic sense of the poem as a kind of secret history. . . .
http://books.google.com.ph/books?id=ttMlqGMYCsIC&pg=PA46&lpg...
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Mine wisdom:

Whatever the secret, shame, pain or joy, these can be the seat to our own wisdom practice. One powerful way to mine wisdom, and spiritual connection from those experiences is through the practice of journal writing.
http://roulette404.multiply.com/reviews/item/48

Human skill brings to light hidden treasures from the mines of the earth, jewels brought back from deep darkness. But can humans mine wisdom?
http://books.google.com.ph/books?id=TImivdREOrAC&pg=PA99&lpg...

Post selection offering:
The other responses to me smack too much of Indonesian influence. As a native speaker, I'm happy with 'pursuing knowledge' as an equivalent of 'menggali pengetahuan', not so happy with 'seeking the truth' for 'menambang ilmu'. There are probably better equivalents.