Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
hien sach » dien sach, kien sach, thien hach
trong van » trong cac
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
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: hoc hien sach - thanh ((trung tuan) or (trong van)) dung cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - thanh ((trung tuan) OR (trong van)) dung cong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - thanh ((trung tuan) or (trong van)) dung cong tan toan cao*.