Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
trinh va » trinh van, trinh vat, trinh ve
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu xanh) or (chiet tach)) - hanh trinh va ((nhung cong) OR (thong cong)) dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (chiet tach)) - hanh trinh va ((nhung cong) OR (thong cong)) dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (chiet tach)) - hanh trinh va ((nhung cong) OR (thong cong)) dan van ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chiet tach)) - hanh trinh va ((nhung cong) OR (thong cong)) dan van ban*.