Perhaps you should try some spelling variations:
host plants » host plant
plants lice » plant lice, plant life, plants fires
wang yang » wang yan, wang liang, wang yanling
yang yang » wang yan
shang hai » shang kai, dang hai, chang ha
yang oil » yang zili, yang di, yang xi
oil host » oil cost
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 yang oil host plants lice ((shang hai) or (wong yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang yang oil host plants lice ((shang hai) OR (wong yue)) ;.
• Adding a wildcard symbol may retrieve word variants: wang yang yang oil host plants lice ((shang hai) or (wong yue)) ;*.