like: untersuchen → →
untersuchen ☊ 
điều tra ☊ 
☊ untersuchen ☊ 调查 ☊ diàochá The health authorities are investigating the problem. ☊ authority ☊
examine sb/sth: The doctor examined her but could find nothing wrong. ☊ examine ☊
examine sth/sb for sth: The goods were examined for damage on arrival. ☊ examine ☊
investigate sth: Police are investigating possible links between the murders. ☊ investigate ☊
investigate what, how, etc...: Police are investigating what happened. ☊ investigate ☊
investigate (sth): Scientists are investigating the effects of diet on fighting cancer. ☊ investigate ☊
investigate how, what, etc...: The research investigates how foreign speakers gain fluency. ☊ investigate ☊
to explore/consider/investigate a wide range of possibilities ☊ possibility ☊
Scientists are studying photographs of the planet for signs of life. ☊ study ☊
study how, what, etc...: The group will study how the region coped with the loss of thousands of jobs. ☊ study ☊