Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
lang van » dang van, tang van, hoang van
thanh de » hanh de, thanh ve, thanh do
cau tren » cu tren, dau tren, ca tren
so sach » so sanh, bo sach, co sach
van hoi » van hoa, van hoc, van hoe
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
tac ban » tai ban, tao ban, cac ban
de cau » ke cau, le cau, ve cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach _ lang van hoi. hieu va cac tac ban thanh de cau tren~.
• Adding a wildcard symbol may retrieve word variants: so sach _ lang van hoi. hieu va cac tac ban thanh de cau tren*.