Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trang » thanh trung, canh tranh, hanh trinh
tieu xanh » tieu danh, chieu xanh, dieu hanh
dang cong » dung cong
anh bang » anh hoang, anh quang, tinh bang
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu xanh - ((anh bang) or (hanh trang)) cua ((nhung cong) or (dang cong)) tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - ((anh bang) OR (hanh trang)) cua ((nhung cong) OR (dang cong)) tap toan ban.
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - ((anh bang) or (hanh trang)) cua ((nhung cong) or (dang cong)) tap toan ban*.