Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
nhanh lang » nhanh quang, nhanh thang, nhan dang
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
lang van » dang van, tang van, hoang van
chan cao » chan cho, chay cao, toan cao
chat cao » chat co, chat cho, chat bao

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - nhanh lang van ((dung cong) OR (thong cong)) dan ((chan cao) OR (chat cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - nhanh lang van ((dung cong) or (thong cong)) dan ((chan cao) OR (chat cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - nhanh lang van ((dung cong) or (thong cong)) dan ((chan cao) OR (chat cao))*.