Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
nguong dan » huong dan
nhan dang » nhan dan, phan dang, tran dang
cua trung » cua truong, xuan trung, cua nhung
xuong san » xuong song, cong san, dong san
dang cua » dung cua, dong cua, mang cua
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 (chinh sach)) - nhan dang cua trung ((nguong dan) or (xuong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chinh sach)) - nhan dang cua trung ((nguong dan) OR (xuong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chinh sach)) - nhan dang cua trung ((nguong dan) or (xuong san)) toan cao*.