Perhaps you should try some spelling variations:
duong vanh » duong xanh, duong anh, duong thanh
hieu lang » chieu sang, hieu quang, nhieu tang
canh manh » lanh manh, canh tranh, cach mang
cua nhung » va nhung
duong van » duong va, luong va, dang van
hoc hieu » hoc thieu, hoc hien, doc hieu
manh cua » doanh cua, ban cua
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 hieu lang - canh manh cua nhung ((duong vanh) OR (((duong manh) OR (duong van)))) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - canh manh cua nhung ((duong vanh) or (((duong manh) OR (duong van)))) toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - canh manh cua nhung ((duong vanh) or (((duong manh) OR (duong van)))) toan cau*.