Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet thong » thuyet thong, viet thong, theo thong
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
dan toan » van toan, dan than, manh toan

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 thiet thong cong ((dan toan) or (anh tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trinh thiet thong cong ((dan toan) OR (anh tuan)) ban*.