Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thang long » thanh cong
hoc thieu » toc thieu, hoc hien
giang van » hoang van, dang van, gian dan
dang cong » dung cong
dan phan » doan phan, dan chan, van phan
phan lap » phan dau

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 - thach giang van ((dang cong) or (thang long)) dan phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thach giang van ((dang cong) OR (thang long)) dan phan lap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thach giang van ((dang cong) or (thang long)) dan phan lap*.