Perhaps you should try some spelling variations:
trinh luan » trinh luat, trinh quan, trinh han
hanh trinh » canh tranh, hanh chinh
chau tinh » cuu tinh, ha tinh, cua tinh
yen tinh » tuyen tinh
luan han » luan hoan, luan phan, luan van
han cong » phan cong, hang cong, hanh cong
dan toan » van toan, dan than, manh toan
ban than » ban thanh, van thanh, ban hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chau tinh) or (yen tinh)) - hanh trinh luan han cong ((dan toan) or (ban than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chau tinh) OR (yen tinh)) - hanh trinh luan han cong ((dan toan) OR (ban than)) cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chau tinh) or (yen tinh)) - hanh trinh luan han cong ((dan toan) or (ban than)) cau*.