Perhaps you should try some spelling variations:
exchange robert » change robert, change roberto, exchange reserve
wang liang » wang yang
new anion » new action, new nation, new asian
new union » der union, new unit
tan ying » fan ying, ran ying, tan yang
robert b » robert _, robert e, robert j
3 times » _ times, 3 time, a times

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: ((tan ying) OR (wang liang)) 3 times ((new anion) OR (new union)) exchange robert b ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tan ying) or (wang liang)) 3 times ((new anion) OR (new union)) exchange robert b ;~".
• Adding a wildcard symbol may retrieve word variants: ((tan ying) or (wang liang)) 3 times ((new anion) OR (new union)) exchange robert b ;*.