Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thong cong » trong cong, tong cong, thong thong
hanh tang » hanh trang, anh tang, hanh mang
cua thong » cua thuong, cua khong, cua tong
hach toan » thanh toan, manh toan
tang cua » mang cua, hang cua, tang luan
tac toan » tap toan, tam toan, tich 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 (hach toan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu sach - hanh tang cua thong cong ((tac toan) OR (hach toan)) tap".
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - hanh tang cua thong cong ((tac toan) OR (hach toan)) tap*.