Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
hien xanh » hien hanh, hien nhanh, chieu xanh
cua nhung » va nhung
cong vang » cong lang, cong quang, cong ngang
cong van » cong san, song van, cong tan
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 tranh) OR (hanh trinh)) cua nhung ((cong van) OR (cong vang)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((hanh tranh) OR (hanh trinh)) cua nhung ((cong van) or (cong vang)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh tranh) OR (hanh trinh)) cua nhung ((cong van) or (cong vang)) toan cau*.