Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc chieu » hoc thieu, ho chieu, hoc hien
tranh cua » doanh cua, manh cua
nhung don » nhung bo
nhung van » phung van, nhung bai, nhung cau
dung cong » dung trong
toan cao » toan ban, toan tap

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 tranh cua ((((nhung don) OR (nhung van))) OR (dung cong)) tinh toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu xanh - hanh tranh cua ((((nhung don) OR (nhung van))) or (dung cong)) tinh toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - hanh tranh cua ((((nhung don) OR (nhung van))) or (dung cong)) tinh toan cao*.