Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh toan » tinh toan, thanh toan, trinh han
doi chieu » doc hieu, doi chi, ho chieu
tong cong » trong cong, cong cong, dung cong
trung ba » truong ba, trung ha, trung bo
trung va » truong va, trang va, trung ha
toan cau » 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 ba) OR (trung va)) tong cong trinh toan cau~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh ((trung ba) or (trung va)) tong cong trinh toan cau*.