Perhaps you should try some spelling variations:
hien sach » dien sach, kien sach, thien hach
trung van » truong van, trung va, trung tuan
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 van) OR (trong van)) dung cong tan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien sach - thanh ((trung van) OR (trong van)) dung cong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - thanh ((trung van) OR (trong van)) dung cong tan toan cao*.