Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trinh » canh tranh, hanh chinh
chau tinh » cuu tinh, ha tinh, cua tinh
cua trong » cua truong, cua trung, qua trong
doi chau » doi chieu, gioi chau, hoi chu
cong san » cong tac
san van » tan van, luan van, tran van

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 - ((hanh trinh) or (thanh trung)) cua trong cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chau tinh - ((hanh trinh) OR (thanh trung)) cua trong cong san van ban*.