Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
trinh ve » trinh he, trinh va, trinh vi
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: doi chieu sach - hanh trinh ve ((hang cong) or (dang cong)) tinh ((toan tap) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh trinh ve ((hang cong) OR (dang cong)) tinh ((toan tap) OR (toan ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh trinh ve ((hang cong) or (dang cong)) tinh ((toan tap) OR (toan ban))*".