1) Trinh Cong Son is still famous with his songs . He was dead years ago
=> Trinh Cong Son, who was dead years ago, is still famous with his songs.

2) People often give lucky money to children on New Year day . It symbolizes luckiness in the new year
=> That people often give lucky money to children on New Year Day symbolizes luckiness in the new year.

3) Lots of roses are sold on Valentine Day . They are symbols of love
=> Lots of roses which are symbols of love are sold in Valentine Day.

4) Ao Dai is loved by many Miss World . It is a traditional dress of Vietnam
=> Ao Dai which is a traditional dress of Vietnam is loved by many Miss World.

5) Laura spent much time on her fashion collection . It's being shown on her graduation
=>Laura spent much time on hes fashion collection which is being show on her graduation.

6) The tea set will appear in the exhibition . It used to be drunk by Can Long King
=> The tea set which used to be drunk by Can Long King will appear in the exhibition.

7) Cong Tu Bac Lieu is very old and poor now . He used to be very rich
=> Cong Tu Bac Lieu, who used to be very rich, is very old and poor now.

8) He finally finished the website . The website introduces Vietnam to the world
=> He finally finished the website that introduces Vietnam to the world.

9) Turkey is a traditional dish of America . It's eaten on Christmas Eve
=>Turkey which is eaten on Christmas Eve is a traditional dish of America

10) The man is one of my best friends . He brings in a big bunch of flowers
=>The man bringing in a big punch of flowers is one of my best friends.