Perhaps you should try some spelling variations:
sharing mining » sharing during, sharing learning
costo sharing » cost sharing, loss sharing, case sharing
mining coal » managing coal, mining formal, burning coal
dong yang » dong hoang, wang yang, yang yang
di costo » del costo, di cristo, da costa
coal seo » coal seam, coal use, coal bed
ling di » ling li, ling dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong yang) or (wang yan)) ling di costo sharing mining coal seo ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong yang) OR (wang yan)) ling di costo sharing mining coal seo ;*.