Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trinh luan » trinh quan, trinh han, trinh toan
hoc thieu » toc thieu, hoc hien
bang song » nang song
song dan » song danh, song van, cong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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 ((trinh luan) or (trinh luat)) bang song dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((trinh luan) OR (trinh luat)) bang song dan toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((trinh luan) or (trinh luat)) bang song dan toan ban*.