Perhaps you should try some spelling variations:
among farmers » salmon farmers
patients 1.8 » patients 10.1, patients 10.5, patients 10.6
1.8 among » 1.5 among, 19 among, 1 among
wei yang » pei yang, wei wang, wei yang's
wai yan » wang yan
fan de » aan de, jan de, can de
van de » van der, van den

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((wai yan) OR (wei yang)) yang ((fan de) OR (van de)) patients 1.8 among farmers ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wai yan) OR (wei yang)) yang ((fan de) or (van de)) patients 1.8 among farmers ;~".
• Adding a wildcard symbol may retrieve word variants: ((wai yan) OR (wei yang)) yang ((fan de) or (van de)) patients 1.8 among farmers ;*.