Perhaps you should try some spelling variations:
planting vinh » planting time
test planting » test playing, tree planting, cost planning
yang yang » wang yang, wang yan
chong yun » chang yun, hong yu, chen yun
yana hua » wang hua, tan hua, ya hua
long yun » long run, song yun, young yun

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: yang yang ((yana hua) OR (can china)) test planting vinh ((long yun) OR (chong yun)) ;~.
• Adding a wildcard symbol may retrieve word variants: yang yang ((yana hua) or (can china)) test planting vinh ((long yun) or (chong yun)) ;*.