Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
canh manh » lanh manh, cach mang, van manh
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » 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 - ((canh manh) or (canh tranh)) va thong cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((canh manh) OR (canh tranh)) va thong cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((canh manh) or (canh tranh)) va thong cong dan toan cau*.