Collocations for difficult - adj.

be, look, prove, remain, seem, sound
become, get
It is getting more and more difficult to find a job.

make sth
The fog made driving very difficult.

find sth

extremely, fairly, very, etc.
exceedingly, extraordinarily, incredibly, particularly
doubly
Her disability made taking care of the home and raising a family doubly difficult.

increasingly
a little, slightly, etc.
notoriously
Birth rates are notoriously difficult to predict.

Difficult is used with these nouns:
area, aspect, assignment, birth, catch, challenge, chapter, child, childhood, choice, circumstance, climb, concept, condition, decision, delivery, descent, dilemma, enterprise, exam, exercise, feat, fixture, ground, hurdle, idea, issue, job, journey, labour, life, manoeuvre, matter, meeting, moment, negotiation, part, patch, period, position, predicament, pregnancy, problem, process, proposition, question, relation, relationship, road, season, situation, stage, subject, sum, target, task, temperament, terrain, test, thing, time, topic, transition, trick, undertaking, word, work