Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
ho chiet » ho chieu, ho thiet, hoc thiet
va duong » van duong, va tuong, va huong
cong van » cong vang, cong san, song van
va dung » van dung, vat dung, va ung
tai tap » bai tap, hai tap, lai tap
tai tao » tai sao

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 trinh ((va dung) or (va duong)) cong van ((tai tap) OR (tai tao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh trinh ((va dung) OR (va duong)) cong van ((tai tap) OR (tai tao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - hanh trinh ((va dung) or (va duong)) cong van ((tai tap) OR (tai tao))".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh trinh ((va dung) or (va duong)) cong van ((tai tap) OR (tai tao))*.