Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
nhanh lang » nhanh quang, nhanh thang, nhan dang
hoc thieu » toc thieu, hoc hien
luan hoan » luan van
luan han » luan phan, luan van, luan san
tong tap » tuong tac, trong tan, cong tac
tap doan » tap quan
doan dau » doan dieu, phan dau, doan va

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 - nhanh lang ((luan han) or (luan hoan)) tong tap doan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - nhanh lang ((luan han) OR (luan hoan)) tong tap doan dau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - nhanh lang ((luan han) or (luan hoan)) tong tap doan dau*.