Perhaps you should try some spelling variations:
dang thuong » dung thuong, dong thuong, nang thuong
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc chieu » hoc thieu, ho chieu, hoc hien
tranh cua » doanh cua, manh cua
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sang - hanh tranh cua ((dang thuong) or (hang thuong)) tinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - hanh tranh cua ((dang thuong) OR (hang thuong)) tinh toan cao*.