Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh tin » trinh toan, trinh tu, trinh han
trinh cua » tinh cua, trinh luat, trinh quan
tong cong » trong cong, cong cong, dung cong
cua tong » cua cong, cua dong, cua nong
san toan » van toan, dan toan, manh toan
dan than » dan chan, ban than, van than

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

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