Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, hanh trinh, minh trang
hoc chieu » hoc thieu, ho chieu, hoc hien
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
hach toan » thanh toan, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sach - ((hanh trang) or (canh tranh)) cua ((cong cong) OR (dung cong)) hach toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - ((hanh trang) OR (canh tranh)) cua ((cong cong) OR (dung cong)) hach toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - ((hanh trang) or (canh tranh)) cua ((cong cong) OR (dung cong)) hach toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - ((hanh trang) or (canh tranh)) cua ((cong cong) OR (dung cong)) hach toan cao*.