Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
dung cong » dung trong
hanh ban » thanh ban, hanh san, hanh han
hang ban » hang luan, hang va, hang tai
cua dung » cua dang, cua dong, qua dung
toan tai » doanh tai, toan ban, toan cao
toan tap » toan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - ((hanh ban) OR (hang ban)) cua dung cong trinh ((toan tai) OR (toan tap))~.
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - ((hanh ban) or (hang ban)) cua dung cong trinh ((toan tai) or (toan tap))*.