Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, dien sach
hien hanh » dieu hanh
hoc sach » hoc sinh, hoc cac, hoc anh
lang van » dang van, tang van, hoang van
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
co sach » bo sach, cuon sach
van hoi » van hoa, van hoc, van hoe
y lang » o lang, _ lang, tay lang
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) OR (hoc sach)) y lang van hoi. hieu ((hien bach) or (hien hanh)) nuoc va danh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (hoc sach)) y lang van hoi. hieu ((hien bach) OR (hien hanh)) nuoc va danh vi cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) OR (hoc sach)) y lang van hoi. hieu ((hien bach) or (hien hanh)) nuoc va danh vi cua tu*".