diff --git a/docs/tieng-anh/tu-vung/thanh-ngu.md b/docs/tieng-anh/tu-vung/thanh-ngu.md
index dcd073c..f3b60c3 100644
--- a/docs/tieng-anh/tu-vung/thanh-ngu.md
+++ b/docs/tieng-anh/tu-vung/thanh-ngu.md
@@ -11,4 +11,15 @@ permalink: /tieng-anh/tu-vung/thanh-ngu
 * to outdo yourself: to do better than normally
 * to be out of question: to be imposssible to accomplish
 * to be back in the saddle: to return to normal activities, especially after an illness or injury
-* to be a piece of cake: to be very easy
\ No newline at end of file
+* to be a piece of cake: to be very easy
+* take sth with a grain/pinch of salt: to doubt the truth or value of something
+* stab someone in the back: betray or hurt someone who trusts you
+* easier said than done: not as easy as it appears to be
+* every cloud has a silver lining: you can find good in every bad situation
+* get something off your chest: To talk about something that has been bothering you for a long time; to admit something you have done wrong.
+* Go down in flames: To fail suddenly and spectacularly
+* In the nick of time: just before the last moment when something can be changed or something bad will happen
+* Let the cat out of the bag: to tell secret
+* Let the chips fall where they may: To let something happen, no matter if it's good or bad
+* Once in a blue moon: rarely
+* Sleep on it: To think about something for a while before making a decision.