Perhaps you should try some spelling variations:
hien sach » dien sach, kien sach, thien hach
cong span » cong san, long span, dong san
span phan » san phan, san pham, luan phan
dien anh » tieng anh, dien dan
ca trong » cay trong, cad trong, co trong
phan lap » phan dau
anh dan » anh dang, anh danh, canh dan

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 (dien anh)) - anh dan ca trong cong span phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (dien anh)) - anh dan ca trong cong span phan lap*.