Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
quan thanh » ban thanh, van thanh
hieu manh » hieu nganh, dieu hanh, hien hanh
tran tuan » tran xuan, tran quang, tran thanh
dung cong » dung trong
cong rac » cong tac, cong cac, cong dac
rac tren » ran tren, tac tren, sach tren
tren cau » tren ca, tren cay, tren tau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu manh) OR (chieu xanh)) - thanh ((tran tuan) or (quan thanh)) dung cong rac tren cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (chieu xanh)) - thanh ((tran tuan) OR (quan thanh)) dung cong rac tren cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) OR (chieu xanh)) - thanh ((tran tuan) or (quan thanh)) dung cong rac tren cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) OR (chieu xanh)) - thanh ((tran tuan) or (quan thanh)) dung cong rac tren cau*.