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