Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
trang cua » tranh cua, tang cua, trung cua
tran tuan » tran xuan, tran quang, tran thanh
hang cong » dang cong, hang nong, bang cong
tran van » luan van
tan van » tang van, luan van, dang van

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 - hanh ((trang cua) OR (tran tuan)) hang cong ((tan van) OR (tran van)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((trang cua) or (tran tuan)) hang cong ((tan van) OR (tran van)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((trang cua) or (tran tuan)) hang cong ((tan van) OR (tran van)) ban*.