Perhaps you should try some spelling variations:
testing phase » testing part, ending phase, testing based
using phase » using past, closing phase, single phase
tan yang » dan yang, tan ying, tan yong
time att » time art, time a, time age
robert b » robert _, robert e, robert j
un yang » daun yang, dan yang, hui yang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tan yang) or (un yang)) 3 time att ((using phase) OR (testing phase)) robert b ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tan yang) OR (un yang)) 3 time att ((using phase) OR (testing phase)) robert b ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tan yang) or (un yang)) 3 time att ((using phase) OR (testing phase)) robert b ;*".