Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
trinh cua » tinh cua, trinh luat, trinh quan
dang cong » dung cong
ho chiet » ho chieu, ho thiet, hoc thiet
toan cao » toan tap
toan ban » van ban

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 cua ((nhung cong) or (dang cong)) dan ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh trinh cua ((nhung cong) OR (dang cong)) dan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - hanh trinh cua ((nhung cong) or (dang cong)) dan ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh trinh cua ((nhung cong) or (dang cong)) dan ((toan cao) OR (toan ban))*.