Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
anh mang » hanh mang, anh bang, anh dang
mang cua » manh cua, dung cua, ban 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: theo ((chieu sach) or (trieu tinh)) - anh mang cua ((nhung cong) OR (dung cong)) manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (trieu tinh)) - anh mang cua ((nhung cong) OR (dung cong)) manh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (trieu tinh)) - anh mang cua ((nhung cong) OR (dung cong)) manh toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (trieu tinh)) - anh mang cua ((nhung cong) OR (dung cong)) manh toan cau*.