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
tranh cua » doanh cua, manh cua
cua nhung » va nhung
tan toan » van toan, dan toan, tam toan
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu sang - hanh tranh cua nhung cong ((((tan toan) OR (tap toan))) or (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - hanh tranh cua nhung cong ((((tan toan) OR (tap toan))) OR (tan tran)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu sang - hanh tranh cua nhung cong ((((tan toan) OR (tap toan))) or (tan tran)) cau*".