Perhaps you should try some spelling variations:
trinh trung » trinh truong, trinh trong, sinh trung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
tinh than » tinh thanh, tinh toan, tinh thai
dung cong » dung trong
than cua » nhan cua, thai cua, ban cua
trung ca » trung cap, truong ca, trung cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - tinh than cua ((dung cong) or (trong cong)) trinh trung ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - tinh than cua ((dung cong) OR (trong cong)) trinh trung ca.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - tinh than cua ((dung cong) or (trong cong)) trinh trung ca*.