Perhaps you should try some spelling variations:
nhanh thang » nhanh thanh, nhanh quang, hanh trang
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nhanh lang » nhanh quang, nhan dang, nhanh dong
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
dan toan » van toan, dan than, manh toan

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 - ((nhanh lang) OR (nhanh thang)) cua nhung cong ((dan toan) or (tinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((nhanh lang) OR (nhanh thang)) cua nhung cong ((dan toan) OR (tinh toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((nhanh lang) OR (nhanh thang)) cua nhung cong ((dan toan) or (tinh toan)) cau".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((nhanh lang) OR (nhanh thang)) cua nhung cong ((dan toan) or (tinh toan)) cau*.