Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, nhung don
doi chieu » doc hieu, doi chi, ho chieu
hanh tran » hanh trang, thanh tran, hanh tram
tran tuan » tran xuan, tran quang, tran thanh
hang cong » dang cong, hang nong, bang cong
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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 tran tuan ((nhung cong) OR (hang cong)) tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh tran tuan ((nhung cong) OR (hang cong)) tac toan cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh tran tuan ((nhung cong) OR (hang cong)) tac toan cau*.