Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
thuoc cong » truoc cong, thuoc trong, thu cong
cong long » cong luong, cong dong, cong cong
ho chieu » theo chieu, hoc thieu, mot chieu
long dan » long doan, cong dan, nong dan
dan phan » doan phan, dan chan, van phan

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 cong long dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (toc thieu)) sach - thanh cong thuoc cong long dan phan tu*.