Perhaps you should try some spelling variations:
hanh trang » thanh trung, hanh trinh, minh trang
doan tung » doan trung, doan hung, doan ung
hoc dieu » hoc thieu, hoc hien
cua doan » cua doanh, cua dan, cua toan
tung dan » dung dan, huong dan, trung dai
dan toan » van toan, dan than, manh 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: hoc dieu hanh - ((hanh trang) or (canh tranh)) cua doan tung dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu hanh - ((hanh trang) OR (canh tranh)) cua doan tung dan toan ban*.