Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chiet tach, chieu sang, chieu xanh
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (chinh sach)) - ((thanh trung) or (hanh trinh)) cua nhung cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chinh sach)) - ((thanh trung) OR (hanh trinh)) cua nhung cong van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chinh sach)) - ((thanh trung) or (hanh trinh)) cua nhung cong van toan cao*.