Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » thong cong, hang cong, nhung don
doi chieu » doc hieu, doi chi, ho chieu
trung cap » truong cao, trung tam
dung cong » dung trong
trung ha » trung hoc, trung tam
toan cao » toan ban, toan tap

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

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