Perhaps you should try some spelling variations:
knowing about » known about, know about, knowing your
ming knowing » seeing knowing, me knowing, ming kong
binh thang » binh thanh, bin zhang, binh thuan
yang guang » yang yang, yang liang
yan guan » gan guan, yan yuan, yihan guan
hans » has, hand

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

• Performing a fuzzy search may retrieve terms with similar spellings: binh thang ((yang guang) or (yan guan)) dr hans ming knowing about ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: binh thang ((yang guang) OR (yan guan)) dr hans ming knowing about ;*.