Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhanh lang » nhanh quang, nhanh thang, nhan dang
dong thanh » truong thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
dang dong » dang cong, dung dong, dan dong
lang cua » mang cua, hang cua, long cua
cua dang » cua cong, cua ban
toan cao » toan tap
toan ban » van 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: theo ((hieu manh) OR (chiet tach)) - nhanh lang cua dang dong thanh ((toan cao) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (chiet tach)) - nhanh lang cua dang dong thanh ((toan cao) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (chiet tach)) - nhanh lang cua dang dong thanh ((toan cao) OR (toan ban))*.