Perhaps you should try some spelling variations:
shear testing » seed testing, self testing, shear tests
yang guang » yang yang, yan guan, yang liang
joon chang » hoong chang, boon chong, jin chang
guang yan » huang yang, wang yan, zhang yan
yan shear » can hear
yi chang » ii chang, ying chang, jin chang

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

• Performing a fuzzy search may retrieve terms with similar spellings: yang guang yan shear testing using ((yi chang) or (joon chang)) jin ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang guang yan shear testing using ((yi chang) OR (joon chang)) jin ;*.