Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
thuoc dang » thuoc dung, thuoc khang, thuc dan
lang thang » cang thang, dang thanh, hung thang
dang cong » dung cong
cong lang » cong vang, cong luong, cong quang
ho chieu » theo chieu, hoc thieu, mot chieu
thang tu » thong tu, thanh tu, hang tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (toc thieu)) sach - thanh cong thuoc dang cong lang thang tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (toc thieu)) sach - thanh cong thuoc dang cong lang thang tu.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (toc thieu)) sach - thanh cong thuoc dang cong lang thang tu*.