Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
nhung don » nhung van, nhung bo
hang cong » dang cong, hang nong, bang cong
manh toan » thanh toan, anh tuan, tinh toan
tinh cua » trinh cua, sinh cua, tinh chat
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: nho ((hieu lang) or (chieu sach)) - hanh tinh cua ((nhung don) or (hang cong)) manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu lang) OR (chieu sach)) - hanh tinh cua ((nhung don) OR (hang cong)) manh toan cau.
• Adding a wildcard symbol may retrieve word variants: nho ((hieu lang) or (chieu sach)) - hanh tinh cua ((nhung don) or (hang cong)) manh toan cau*.