Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
doi chiet » doi chieu, doi chi, doi viet
trinh hoa » trinh do, trinh han
lang cong » dang cong, bang cong, hang cong
hoa lang » hoa dan, hoa van
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - hanh trinh hoa lang cong ((dan toan) or (tinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - hanh trinh hoa lang cong ((dan toan) OR (tinh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - hanh trinh hoa lang cong ((dan toan) or (tinh toan)) cau*.