Perhaps you should try some spelling variations:
duong trong » dung trong
thieu sach » chieu sach, thien hach, hieu cach
trinh tuan » trinh quan, trinh luan, trinh xuan
trinh toan » tinh toan, thanh toan, trinh han
hoc thieu » toc thieu, hoc hien
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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 tuan) OR (trinh toan)) duong trong ((dan than) or (van than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((trinh tuan) OR (trinh toan)) duong trong ((dan than) OR (van than)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((trinh tuan) OR (trinh toan)) duong trong ((dan than) or (van than)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((trinh tuan) OR (trinh toan)) duong trong ((dan than) or (van than)) ban*.