Perhaps you should try some spelling variations:
one parent » lone parents, one percent, one part
one agent » one event, one gene, und agent
wing yan » wang yan, wing ian, wing tan
yang jui » yang judy, yang di, yang xi
thi kong » thi mong, tan kong
thi hong » tan hong
yan jui » yang jun, yang hui

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: wing yan ((yan jui) OR (yang jui)) ((one agent) OR (one parent)) ((thi kong) OR (thi hong)) sar ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wing yan ((yan jui) or (yang jui)) ((one agent) OR (one parent)) ((thi kong) or (thi hong)) sar ;~".
• Adding a wildcard symbol may retrieve word variants: wing yan ((yan jui) or (yang jui)) ((one agent) OR (one parent)) ((thi kong) or (thi hong)) sar ;*.