Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
tung va » trung va, tuong va, dung va
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - thanh tung va ((hang cong) or (hang nong)) dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh tung va ((hang cong) OR (hang nong)) dan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh tung va ((hang cong) or (hang nong)) dan van ban*.