Perhaps you should try some spelling variations:
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
yang oil » yang zili, yang di, yang xi
line pll » line call, line plot, line plus
hong hai » shang hai, zhong tai, dang hai
wong yue » wang yue, hong yu
oil oil » coal oil
line li » line hi, line log

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang wang yang oil oil ((line li) OR (line pll)) ((hong hai) or (wong yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yang oil oil ((line li) OR (line pll)) ((hong hai) OR (wong yue)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang wang yang oil oil ((line li) OR (line pll)) ((hong hai) or (wong yue)) ;*".