Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
trinh qua » trinh quan, trinh cua, trinh quang
qua dung » quang dung, su dung, qua song
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, dang thanh
van than » van thanh, van thang, van tuan
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh trinh qua dung trong ((((dan toan) or (dan than))) or (van than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trinh qua dung trong ((((dan toan) OR (dan than))) OR (van than)) cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh trinh qua dung trong ((((dan toan) or (dan than))) or (van than)) cau*.