Perhaps you should try some spelling variations:
hoc thieu » hoc hien
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 dan » thuc hanh, hoc dan, thuc vat
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (toc thieu)) sach - phan dang dang cong thuc dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) sach - phan dang dang cong thuc dan khan cap.
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (toc thieu)) sach - phan dang dang cong thuc dan khan cap*.