(1) worried, anxious, uneasy, uncomfortable, ill at ease; worry, concern like: thắc mắc → →
die Anfrage ☊ 
chất vấn, thắc mắc ☊ 
☊ Er ist in einem anderen Land aufgewachsen und hat viele Fragen: ☊ Anh ta trưởng thành trên một nước khác và có nhiều thắc mắc: ☊ (Lektion 81, Nr. 1149) Don't hesitate to ask if you have any queries or concerns about this work. ☊ concern ☊
to deal with enquiries/issues/complaints ☊ deal with sth ☊
an embarrassing mistake/question/situation ☊ embarrassing ☊
Please do not hesitate to contact me if you have any queries. ☊ hesitate ☊
She had a lively and enquiring mind. ☊ mind ☊
routine enquiries/questions/tests ☊ routine ☊