Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
dong toan » dung toan, bong toan, cong toan
tranh va » tranh van, trang va, trinh va
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: hoc ((hieu lang) or (chieu sach)) - canh tranh va nhung cong dong toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (chieu sach)) - canh tranh va nhung cong dong toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (chieu sach)) - canh tranh va nhung cong dong toan cau*.