Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap
luan » quan, lan

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 - hanh ((tran van) or (luan van)) thong cong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((tran van) OR (luan van)) thong cong dan than tap*.