Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, hieu cach
hien hanh » dieu hanh
trung cua » truong cua, trung tuan, trung cap
cong cong » cong dong, trong cong, dung cong
cong toan » cong tan, cong hoan, cong tuan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) or (hien hanh)) - thanh trung cua cong cong cong toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hien hanh)) - thanh trung cua cong cong cong toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hien hanh)) - thanh trung cua cong cong cong toan ban*.