Perhaps you should try some spelling variations:
china rent » china ren, china recent, china real
simon can » simon alan, simon c, simon c.y
wong john » wrong john, kong john, longo john
wong siu » wong shiu, kong siu, wong siew
wong sau » wong sam, wong shiu, wong lai
sin can » sin cain, tin can
dong » doing, long, done

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

• Performing a fuzzy search may retrieve terms with similar spellings: dong ((sin can) or (simon can)) china rent wong john ((wong siu) OR (wong sau)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong ((sin can) OR (simon can)) china rent wong john ((wong siu) OR (wong sau)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong ((sin can) or (simon can)) china rent wong john ((wong siu) OR (wong sau)) ;".
• Adding a wildcard symbol may retrieve word variants: dong ((sin can) or (simon can)) china rent wong john ((wong siu) OR (wong sau)) ;*.