Perhaps you should try some spelling variations:
phan dang » phan dau, phan cong, nhan dan
dang dang » dang dung, dung dang, dang bang
dang cong » dung cong
cong thuc » cong tac
thuc phan » thuc pham, thu phan, thuc chan
ho chieu » theo chieu, hoc thieu, mot chieu
phan tan » phan van, phan tap, phan lan
tan cap » than cap, tan ca, tan lap

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 - phan dang dang cong thuc phan tan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (toc thieu)) sach - phan dang dang cong thuc phan tan cap.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (toc thieu)) sach - phan dang dang cong thuc phan tan cap*.