Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
cong manh » duong manh, cong thanh, hoang manh
cong danh » cuong danh, cong dan, cong thanh
chinh ha » chinh nha, chinh ta, chinh va
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
ha tong » han tong, ha dong, ha tang

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 - hanh chinh ha tong ((cong manh) OR (cong danh)) ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh chinh ha tong ((cong manh) OR (cong danh)) ((toan cau) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh chinh ha tong ((cong manh) OR (cong danh)) ((toan cau) or (toan ban))*.