Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
thang cua » thong cua, hang cua, than cua
tang luan » dung luan
dung cong » dung trong
cong sang » cong san, cong lang, cong vang
sang toan » sang than, dang toan, quang toan
tang cua » mang cua, hang cua, thong cua
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: hoc thieu sach - hanh ((thang cua) or (((tang cua) or (tang luan)))) dung cong sang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((thang cua) OR (((tang cua) OR (tang luan)))) dung cong sang toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((thang cua) or (((tang cua) or (tang luan)))) dung cong sang toan cao*.