Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
dong trong » duong trong, dung trong, cong trong
hien sach » dien sach, kien sach, thien hach
hien hanh » dieu hanh
trong van » trong cac
trong tap » trong thap, tong tap, trong tan
tap quan » tac quan, hai quan
quan cao » quang cao, quan cau, quan ao

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) or (hien hanh)) - thanh trong van dong trong tap quan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (hien hanh)) - thanh trong van dong trong tap quan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (hien hanh)) - thanh trong van dong trong tap quan cao*.