yí nán jiě dá
trouble shooting
solution to difficulties
nán jiě
hard to solve
hard to dispel
hard to understand
hard to undo
nán jiě nán fēn
hard to untie, hard to separate (idiom); inextricably involved
locked in battle
nán fēn nán jiě
to become caught up in an irresolvable situation (idiom)
pái nàn jiě fēn
to remove perils and solve disputes (idiom); to reconcile differences
sǐ jié nán jiě
enigmatic knot hard to untie (idiom); thorny problem
intractable difficulty