Perhaps you should try some spelling variations:
ban hanh » ban hang
thu mang » thu hang, thu bang, thu dang
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat duc » chat xuc, chat doc, chet duoc
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, van anh, van ban
te sach » toc sach
vai cuu » vai cua
mang xa » lang xa, mang may, dang xay

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thu mang xa hoi. hieu van chat duc ((van hanh) OR (ban hanh)) ((vai cuu) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu mang xa hoi. hieu van chat duc ((van hanh) OR (ban hanh)) ((vai cuu) OR (dai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu mang xa hoi. hieu van chat duc ((van hanh) OR (ban hanh)) ((vai cuu) or (dai cua)) tre*".