Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » hanh chinh
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
cong bang » cuong bang, dong bang, hong bang
bang than » bang thanh, ban than, sang than
cua dung » cua dang, cua dong, qua dung
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - ((canh tranh) or (hanh trinh)) cua dung cong bang than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((canh tranh) OR (hanh trinh)) cua dung cong bang than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((canh tranh) or (hanh trinh)) cua dung cong bang than cau*.