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