Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
duong vanh » duong van, duong manh, duong anh
duong xanh » duong manh, duong van, duong sach
hoc thieu » toc thieu, hoc hien
canh manh » lanh manh, cach mang, van manh
cua nhung » va nhung
toan cau » toan cao, toan ban, toan tap

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