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