Cải thiện 
improve like: verbessern → →
verbessern ☊ 
làm cho tốt hơn, cải thiện ☊ 
☊ verbessern ☊ 改进 ☊ gǎi jìn Kritik hilft mir dabei mich zu verbessern. ☊ Sự chỉ trích giúp tôi làm tốt hơn. ☊ (Lektion 108, Nr. 1939) Das müssen Sie verbessern. ☊ Anh / Chị phải làm tốt hơn nữa. ☊ (Lektion 117, Nr. 2230) the need to raise standards of achievement in education ☊ achievement ☊
assume (that)...: It is reasonable to assume (that) the economy will continue to improve. ☊ assume ☊
They're improving day by day. ☊ by ☊
It is simply not the case that prison conditions are improving. ☊ case ☊
The new airport will improve communications between the islands. ☊ communication ☊
an environmental group/movement (= that aims to improve or protect the natural environment) ☊ environmental ☊
He made a genuine attempt to improve conditions. ☊ genuine ☊
I'm sure a few days off would do you a power of good (= improve your health). ☊ do good, do sb good ☊
The situation is not good but we live in hope that it will improve. ☊ hope ☊
If he improved his IT skills, he'd (= he would) easily get a job. ☊ if ☊
Unfortunately, there is nothing we can do to improve matters. ☊ matter ☊
The new management techniques aim to improve performance. ☊ performance ☊
Bankruptcy is a real possibility if sales don't improve. ☊ possibility ☊
Please suggest possible ways in which you would improve the existing program. ☊ possible ☊
They tried everything they possibly could to improve the situation. ☊ possibly ☊
The primary aim of this course is to improve your spoken English. ☊ primary ☊
relation (between A and B): We seek to improve relations between our two countries. ☊ relation ☊
The company is trying to improve customer satisfaction. ☊ satisfaction ☊
it strikes sb how, what, etc...: It suddenly struck me how we could improve the situation. ☊ strike ☊