Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
hien xanh » hien hanh, hien nhanh, chieu xanh
qua dung » quang dung, qua song, qua cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 trang) OR (hanh trinh)) ((qua dung) OR (su dung)) cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((hanh trang) OR (hanh trinh)) ((qua dung) or (su dung)) cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh trang) OR (hanh trinh)) ((qua dung) or (su dung)) cong tac toan cau*.