Perhaps you should try some spelling variations:
duong thanh » muong thanh, luong thanh, dung thanh
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nhanh mang » nhanh lang, nhanh quang, nhanh thang
dong thanh » truong thanh
hanh mang » hanh trang, nhanh lang, thanh hang
cua khong » hua khong, cua phuong, cua thuong
toan tap » toan ban

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 - ((hanh mang) or (nhanh mang)) cua khong ((duong thanh) OR (dong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((hanh mang) OR (nhanh mang)) cua khong ((duong thanh) OR (dong thanh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((hanh mang) or (nhanh mang)) cua khong ((duong thanh) OR (dong thanh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((hanh mang) or (nhanh mang)) cua khong ((duong thanh) OR (dong thanh)) toan tap*.