I have had a hard time with this sound too a few years back. It should be somewhere between the 餓 and 烏 sounds. Among all the pronunciation lectures online, Jennifer's vowel series was the most helpful for me. The "oo" sound that you are looking for is in the Back Vowel clip (lesson 3), and the links to all the clips are pasted below. Wish they help.
Learn Pronunciation of English Vowel Sounds 1 - Introduction
https://www.youtube.com/watch?v=qMM_hwyHxaI
Pronunciation of English Vowel Sounds 2 - Front Vowels, Part 1
https://www.youtube.com/watch?v=haZVOZr48N0
Pronunciation of English Vowel Sounds 2 - Front Vowels, Part 2
https://www.youtube.com/watch?v=KIw6UUpdvis
Pronunciation of English Vowel Sounds 3 - Back Vowels - Part 1 (with captions)
https://www.youtube.com/watch?v=N0T8Q3dJ3uc
Pronunciation of English Vowel Sounds 3 - Back Vowels - Part 2 (with captions)
https://www.youtube.com/watch?v=t1pfQ1XR6TU
Pronunciation of English Vowel Sounds 4 - Central Vowels - Part 1 (with captions)
https://www.youtube.com/watch?v=JTnwyDAz-G0
Pronunciation of English Vowel Sounds 4 - Central Vowels - Part 2 (with captions)
https://www.youtube.com/watch?v=xBELetxAknA
Pronunciation of English Vowel Sounds 5 - Diphthongs (with captions)
https://www.youtube.com/watch?v=mjYVGAKQMdI
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• 多謝肖莊。Jennifer的教程很好。 -小米幹飯- ♂ (0 bytes) () 07/05/2015 postreply 21:19:22