Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh tranh » canh tranh, hanh trinh, hanh trang
cuc phuong » cac phuong, cua phuong, chuc thuong
cuu phuong » cac phuong, thu phuong
thong cap » thong cac, trung cap, thong cua
cap toan » tap toan, lap toan, phap 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 (chiet tach)) - hanh tranh ((cuc phuong) OR (cuu phuong)) thong cap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh tranh ((cuc phuong) OR (cuu phuong)) thong cap toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chiet tach)) - hanh tranh ((cuc phuong) OR (cuu phuong)) thong cap toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - hanh tranh ((cuc phuong) OR (cuu phuong)) thong cap toan cau*.