Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
duong cong » dung cong, duong trong, trong cong
luong cong » dung cong, trong cong, cong cong
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
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 ((hien xanh) or (chieu sang)) - canh tranh cua ((duong cong) OR (luong cong)) tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu sang)) - canh tranh cua ((duong cong) OR (luong cong)) tinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (chieu sang)) - canh tranh cua ((duong cong) OR (luong cong)) tinh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu sang)) - canh tranh cua ((duong cong) OR (luong cong)) tinh toan cau*.