Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien khanh, khien canh
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
tang cua » mang cua, hang cua, tang luan
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
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 (hien nhanh))) or (chieu xanh)) - hanh tang cua nhung cong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hien xanh) OR (hien nhanh))) OR (chieu xanh)) - hanh tang cua nhung cong bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hien xanh) OR (hien nhanh))) or (chieu xanh)) - hanh tang cua nhung cong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((((hien xanh) OR (hien nhanh))) or (chieu xanh)) - hanh tang cua nhung cong bai toan cau*.