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
van dung » van dong, xay dung, tin dung
cong van » cong vang, cong san, song van
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 ung) or (van dung)) 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 ung) OR (van dung)) cong van ((tai tap) OR (tai tao)).
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh trinh ((va ung) or (van dung)) cong van ((tai tap) or (tai tao))*.