Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hien xanh » hien hanh, hien nhanh, hien khanh
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
hoang hai » hoang thi, hoang van
tang cua » mang cua, hang cua, tang luan
cong hai » cong thai, cong ha, cong tac
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 ((hien xanh) OR (chieu xanh)) - hanh tang cua nhung ((cong hai) OR (hoang hai)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (chieu xanh)) - hanh tang cua nhung ((cong hai) OR (hoang hai)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu xanh)) - hanh tang cua nhung ((cong hai) OR (hoang hai)) toan cau*.