Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
trung cua » truong cua, trung cap, dung cua
tap toan » tap doan, tap quan, bai toan

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 ((trung cua) OR (trung tuan)) nhung cong ((tan tran) or (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((trung cua) OR (trung tuan)) nhung cong ((tan tran) OR (tap toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh ((trung cua) OR (trung tuan)) nhung cong ((tan tran) or (tap toan)) cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((trung cua) OR (trung tuan)) nhung cong ((tan tran) or (tap toan)) cau*.