Perhaps you should try some spelling variations:
congresses zhong » congresses china, congresses penang, congresses zu
cost planning » forest planning
risk planning » crisis planning, dose planning, park planning
zhong zhi » zhang zhi, hong ghi, zhong tai
wan yan » wang yan, nan yan, wai yan
y a » y la

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: ((wan yan) OR (dong sin)) y a ((risk planning) OR (cost planning)) congresses zhong zhi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wan yan) or (dong sin)) y a ((risk planning) OR (cost planning)) congresses zhong zhi ;~".
• Adding a wildcard symbol may retrieve word variants: ((wan yan) or (dong sin)) y a ((risk planning) OR (cost planning)) congresses zhong zhi ;*.