Perhaps you should try some spelling variations:
mining using » meaning using, mining during, making using
zhang mining » zhang ming, ghana mining, than mining
using seng » using self, song seng, using se
wing yan » wang yan, wing ian, wing tan
4.2 best » 3.2 best, 4.2 test
2.2 test » 3.2 test, 4.2 test, 2.2 trust

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 lanka ((4.2 best) or (2.2 test)) zhang mining using seng ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wing yan lanka ((4.2 best) OR (2.2 test)) zhang mining using seng ;.
• Adding a wildcard symbol may retrieve word variants: wing yan lanka ((4.2 best) or (2.2 test)) zhang mining using seng ;*.