Perhaps you should try some spelling variations:
thanh tang » thanh thang, thanh trang, thanh tung
dung cong » dung trong
doc hieu » hoc thieu
cong san » cong tac
san phan » san pham, van phan, sat phan
phan cac » nhan cach, phan dau, phan lap
tang su » tang suc, trang su, dang su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((doc hieu) or (toc thieu))) or (hoc hien)) sach - thanh tang su dung cong san phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((doc hieu) OR (toc thieu))) OR (hoc hien)) sach - thanh tang su dung cong san phan cac.
• Adding a wildcard symbol may retrieve word variants: ((((doc hieu) or (toc thieu))) or (hoc hien)) sach - thanh tang su dung cong san phan cac*.