Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yang than » yang dean, yang fan
bilan des » bilanz des, bilan et
than oil » than coal, than only, than one
oil coal » oil cost, oil oil, oil can
plan als » celan als, plan a, plan act
plan des » plan de, plan du
wong yue » wang yue, hong yu

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang than oil coal ((plan als) or (((plan des) or (bilan des)))) ((dang hai) or (wong yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang than oil coal ((plan als) OR (((plan des) OR (bilan des)))) ((dang hai) OR (wong yue)) ;.
• Adding a wildcard symbol may retrieve word variants: wang yang than oil coal ((plan als) or (((plan des) or (bilan des)))) ((dang hai) or (wong yue)) ;*.