Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
tang cua » mang cua, hang cua, tang luan
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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 tang cua nhung ((cong tan) OR (cong tac)) ((toan cau) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh tang cua nhung ((cong tan) OR (cong tac)) ((toan cau) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh tang cua nhung ((cong tan) OR (cong tac)) ((toan cau) or (toan tap))*.