Perhaps you should try some spelling variations:
theo dien » theo tieu, thu dien, thuy dien
dien sach » dien anh
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
anh nang » ganh nang, anh dang, anh sang
anh bang » anh hoang, anh quang, tinh bang
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: theo dien sach - ((anh nang) or (anh bang)) cua ((hang cong) or (bang cong)) dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo dien sach - ((anh nang) OR (anh bang)) cua ((hang cong) OR (bang cong)) dan van ban.
• Adding a wildcard symbol may retrieve word variants: theo dien sach - ((anh nang) or (anh bang)) cua ((hang cong) or (bang cong)) dan van ban*.