Perhaps you should try some spelling variations:
thanh tung » thanh cong
tieu sach » chieu sach, dien sach, te sach
dan khoan » dan khoa, dai khoang, toan khoan
khoan cam » khoa cam, khoan va, phan cam
cap hang » cap hoang, cap bang, cap han
can bang » cao bang, can ban, van ban
cong dan » cong san, cong tan, huong dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - thanh tung ((cap hang) or (can bang)) cong dan khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - thanh tung ((cap hang) OR (can bang)) cong dan khoan cam.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - thanh tung ((cap hang) or (can bang)) cong dan khoan cam*.