Perhaps you should try some spelling variations:
waste handling » data handling
chen young » chen yong, chen yang, chen chung
young john » kong john, wong john, young jean
john wang » john wong
wing yan » wing ian, wing tan, wang yang
hui chen » jui chen, hua chen, yi chen
wang yue » wong yue, wang hua, wang he
yi hui » li hui

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((wing yan) OR (wang yan))) or (waste handling)) yi hui chen young john wang yue ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((wing yan) OR (wang yan))) OR (waste handling)) yi hui chen young john wang yue ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((wing yan) OR (wang yan))) or (waste handling)) yi hui chen young john wang yue ;*".