Perhaps you should try some spelling variations:
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
hanh hang » thanh hang, hang hang, hanh han
cua nhung » va nhung
cam hung » cac chung, cam nang, van hung
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 hanh)) - hanh hang ((cam hung) or (cua nhung)) cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - hanh hang ((cam hung) OR (cua nhung)) cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien hanh)) - hanh hang ((cam hung) or (cua nhung)) cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien hanh)) - hanh hang ((cam hung) or (cua nhung)) cong dan toan cau*.