Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
trang cua » tranh cua, tang cua, trung cua
cong cong » trong cong, dung cong, dang 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: chao ((nhieu tang) or (chieu sach)) - hanh trang cua ((cong cong) OR (cong dong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: chao ((nhieu tang) OR (chieu sach)) - hanh trang cua ((cong cong) OR (cong dong)) tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "chao ((nhieu tang) or (chieu sach)) - hanh trang cua ((cong cong) OR (cong dong)) tac toan cau".
• Adding a wildcard symbol may retrieve word variants: chao ((nhieu tang) or (chieu sach)) - hanh trang cua ((cong cong) OR (cong dong)) tac toan cau*.