Perhaps you should try some spelling variations:
shear testing » self testing, shear tests, user testing
seed testing » field testing
joon chang » hoong chang, boon chong, jin chang
yang yang » wang yang, wang yan
yi chang » ii chang, ying chang, jin chang
yang yi » yang di, yang xi, yang jui

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

• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang yi ((shear testing) OR (seed testing)) using ((yi chang) OR (joon chang)) jin ;~.
• Adding a wildcard symbol may retrieve word variants: yang yang yi ((shear testing) or (seed testing)) using ((yi chang) or (joon chang)) jin ;*.