Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
quang tuan » quang thanh, quan luan, quang cua
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, anh quan, nhanh quang
tuan hung » tran hung, luan hung, tuan dung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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 - anh quang tuan hung ((cong tan) OR (cong san)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - anh quang tuan hung ((cong tan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - anh quang tuan hung ((cong tan) OR (cong san)) toan cau*.