luật bằng trắc 
tone rules (for Chinese and Vietnamese [ luật ] : law, regulation, rule
[ bằng ] : (1) equal to, the same as, even, level, flat, calm, peaceful, safe; (2) to use, be made of; to travel by (means of), be transported by, run (using some fuel); (3) friend, comrade; (4) diploma, certificate; (5) by means of, with, in (language); (6) proof, evidence, support, testimony
[ trắc ] : rosewood, kingwood
Most Common Compounds Set 1:
Most Common Compounds Set 2 :