Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh toan » tinh toan, thanh toan, trinh han
cong thanh » dong thanh, cong trinh, cong tan
duong manh » duong van
hien xanh » hien hanh, hien nhanh, chieu xanh
toan hung » toan chung, toan khung, tran hung
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 - hanh trinh toan hung ((cong thanh) OR (duong manh)) toan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh trinh toan hung ((cong thanh) or (duong manh)) toan cau*.