Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trinh quan » tinh quang, trinh luat, trinh han
trinh cua » tinh cua, trinh luat, trinh luan
hang cong » dang cong, hang nong, bang cong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu sach - hanh ((trinh cua) or (trinh quan)) hang cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - hanh ((trinh cua) OR (trinh quan)) hang cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - hanh ((trinh cua) or (trinh quan)) hang cong san toan cao*.