Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
cua nhung » va nhung
manh toan » thanh toan, anh tuan

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