Perhaps you should try some spelling variations:
gender based » gender bias
based minh » based min, based many, based mainly
dong yang » dong hoang, yang yang, dan yang
wang yang » wang yan, wang liang, wang yanling
cong seo » cong shu, cong sun, von seo
yala a » yala las
hong » long

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong yang) or (wang yang)) yala a gender based minh ((cong seo) OR (hong seo)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong yang) OR (wang yang)) yala a gender based minh ((cong seo) OR (hong seo)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong yang) or (wang yang)) yala a gender based minh ((cong seo) OR (hong seo)) ;*".