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