Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
tang luan » dung luan
van thanh » ban thanh, van tuan
tang cua » mang cua, hang cua, thong cua
dan than » dan chan, ban than, van than

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 ((tang cua) or (tang luan)) thong cong ((dan than) or (van thanh)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((tang cua) OR (tang luan)) thong cong ((dan than) OR (van thanh)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((tang cua) or (tang luan)) thong cong ((dan than) or (van thanh)) ban*.