Perhaps you should try some spelling variations:
yang zhang » yan zhang, zhang zhang, yang yang
jeong yeon » jeong hyeok, jeang yean, seung yeon
wang yang » wang yan, wang liang, wang yanling
low model » flow model, law model, solow model
zhang si » zhang i, zhang ii, zhang li
si testi » i testi, ai test, i test
law pain » law main, law part, law past

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang zhang si testi ((low model) or (law pain)) jeong yeon ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang zhang si testi ((low model) OR (law pain)) jeong yeon ;*.