Perhaps you should try some spelling variations:
trung cong » truong cong, trong cong, trung uong
tang luan » dung luan
theo thu » theo chu, theo tu, theo tieu
thu sach » tu sach, thuat sach, thuoc sach
hang cua » mang cua, hang ca, huong cua
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: theo thu sach - hanh ((hang cua) or (tang luan)) trung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo thu sach - hanh ((hang cua) OR (tang luan)) trung cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: theo thu sach - hanh ((hang cua) or (tang luan)) trung cong san toan cao*.