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
than cao » toan cao, thai cao, than sao
than cap » khan cap, thanh lap, thanh cac

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 ((than cao) OR (than cap))~.
• 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 ((than cao) OR (than cap))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - nhanh lang van ((dung cong) or (thong cong)) dan ((than cao) OR (than cap))*.