Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
canh vang » anh vang, canh van, can bang
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
vang cua » mang cua, hang cua, tang cua
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 ((hieu lang) or (chieu sach)) - canh vang cua ((dung cong) or (dang cong)) manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sach)) - canh vang cua ((dung cong) OR (dang cong)) manh toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chieu sach)) - canh vang cua ((dung cong) or (dang cong)) manh toan cau*.