Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
nhu phuong » thu phuong, nhung phuong, thi phuong
phuong dan » phuong danh, phuong doan, huong dan
bai luan » li luan, vay luan
bai toan » bai tap
dan toan » van toan, dan than, manh toan
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chieu sang)) - thanh ((bai luan) OR (bai toan)) nhu phuong dan toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) OR (chieu sang)) - thanh ((bai luan) or (bai toan)) nhu phuong dan toan tap~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) OR (chieu sang)) - thanh ((bai luan) or (bai toan)) nhu phuong dan toan tap*.