Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
cua thong » cua thuong, cua khong, suat thong
cuong bai » uong bi, cuong ma
anh mang » hanh mang, anh bang, anh dang
cua tong » cua cong, cua dong, cua nong
bai toan » bai tap
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 (nhieu tang)) - anh mang ((cua thong) OR (cua tong)) cuong bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (nhieu tang)) - anh mang ((cua thong) OR (cua tong)) cuong bai toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (nhieu tang)) - anh mang ((cua thong) OR (cua tong)) cuong bai toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (nhieu tang)) - anh mang ((cua thong) OR (cua tong)) cuong bai toan cao*.