Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
dang cong » dung cong
tang cua » mang cua, hang cua, tang luan
cua dang » cua cong, cua ban
tap toan » tap doan, tap quan, bai toan
van toan » van tuan, van tan, van thanh

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 - hanh tang cua dang cong ((tap toan) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - hanh tang cua dang cong ((tap toan) OR (van toan)) cao.
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh tang cua dang cong ((tap toan) or (van toan)) cao*.