Perhaps you should try some spelling variations:
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
trung cua » truong cua, trung cap, dung cua
dung cong » dung trong
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cau » 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: ho ((dieu hanh) or (chiet tach)) - thanh ((trung cua) OR (trung tuan)) dung cong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((dieu hanh) OR (chiet tach)) - thanh ((trung cua) OR (trung tuan)) dung cong van toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((dieu hanh) or (chiet tach)) - thanh ((trung cua) OR (trung tuan)) dung cong van toan cau*".