Perhaps you should try some spelling variations:
dong truong » duong truong, dong trong, dong thuong
chieu sach » chinh sach, chieu sang, chieu xanh
hanh trang » thanh trung, canh tranh, hanh trinh
minh toan » tinh toan, manh toan, hinh toan
minh tuan » anh tuan
trang va » tran van, hang va
va dong » van dong, ha dong, xa dong

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) or (chiet tach)) - hanh trang va dong truong ((minh toan) OR (minh tuan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh trang va dong truong ((minh toan) OR (minh tuan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chiet tach)) - hanh trang va dong truong ((minh toan) OR (minh tuan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - hanh trang va dong truong ((minh toan) OR (minh tuan)) cao*.