Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
xuan nhung » quan nhung, xuan chung, xuan hung
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
canh tran » hanh trang, banh trang, lanh tranh
cong tinh » cong trinh, cong vinh, long tinh
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 tran) OR (canh tranh)) xuan nhung cong tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu sang)) - ((canh tran) OR (canh tranh)) xuan nhung cong tinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (chieu sang)) - ((canh tran) OR (canh tranh)) xuan nhung cong tinh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu sang)) - ((canh tran) OR (canh tranh)) xuan nhung cong tinh toan cau*.