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
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
dan toan » van toan, dan than, manh toan
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 thieu sang - ((hanh trinh) or (canh tranh)) quan ((tong cong) or (dung cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((hanh trinh) OR (canh tranh)) quan ((tong cong) OR (dung cong)) dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((hanh trinh) or (canh tranh)) quan ((tong cong) or (dung cong)) dan toan cao*.