Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
trung cua » truong cua, trung tuan, trung cap
dong tac » cong tac, dong tai, dong bac
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban
cua van » cua ban, cua vat, cua dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) OR (chiet tach)) - thanh trung cua van dong tac toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) OR (chiet tach)) - thanh trung cua van dong tac toan tap".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) OR (chiet tach)) - thanh trung cua van dong tac toan tap*.