Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh tranh » hanh trinh, hanh trang, lanh tranh
nhung cong » dung cong, thong cong, hang cong
bang cong » dang cong, bang song, hang cong
ho chiet » ho chieu, ho thiet, hoc thiet
dan toan » van toan, dan than, manh toan
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: ho chiet tach - ((hanh tranh) OR (canh tranh)) cua ((nhung cong) or (bang cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - ((hanh tranh) OR (canh tranh)) cua ((nhung cong) OR (bang cong)) dan toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - ((hanh tranh) OR (canh tranh)) cua ((nhung cong) or (bang cong)) dan toan cao*".