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

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