Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thong cong » trong cong, tong cong, thong thong
thanh toan » thanh hoa, thanh san, tinh toan
hanh tang » hanh trang, anh tang, hanh mang
cua thong » cua thuong, cua khong, cua tong
tang cua » mang cua, hang cua, tang luan
tac toan » tap toan, tam toan, hach toan

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 tang cua thong cong ((tac toan) or (thanh toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - hanh tang cua thong cong ((tac toan) OR (thanh toan)) tap.
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - hanh tang cua thong cong ((tac toan) or (thanh toan)) tap*.