Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
tieu xanh » tieu danh, chieu xanh, dieu hanh
dung cong » dung trong
qua dung » quang dung, su dung, qua song
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

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 trang) or (hanh trinh)) qua dung cong ((tap toan) OR (tap quan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - ((hanh trang) OR (hanh trinh)) qua dung cong ((tap toan) OR (tap quan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - ((hanh trang) or (hanh trinh)) qua dung cong ((tap toan) OR (tap quan)) cao".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - ((hanh trang) or (hanh trinh)) qua dung cong ((tap toan) OR (tap quan)) cao*.