Perhaps you should try some spelling variations:
vien nganh » vien thanh
hanh trung » thanh trung, hanh trang, manh trung
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung cua » truong cua, trung tuan, trung cap
cong cong » cong dong, trong cong, dung cong
cong lang » cong vang, cong luong, cong quang
lang than » lang thang, lang thanh, sang than
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) or (vien nganh)) - hanh trung cua cong cong lang than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (vien nganh)) - hanh trung cua cong cong lang than cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (vien nganh)) - hanh trung cua cong cong lang than cau*.