Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
trinh han » trinh quan
cong lang » cong vang, cong luong, cong quang
duong van » duong va, luong va, dang van
doc hieu » toc thieu, hoc thieu, hoc hien
han cong » phan cong, hang cong, hanh cong
cong van » cong vang, cong san, song van
toan cau » toan cao, toan ban, toan tap

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 - hanh trinh han cong ((((cong van) or (cong lang))) or (duong van)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh trinh han cong ((((cong van) OR (cong lang))) OR (duong van)) toan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh trinh han cong ((((cong van) or (cong lang))) or (duong van)) toan cau*.