Perhaps you should try some spelling variations:
hoc thieu » hoc hien
phan dung » phan ung, phan dang, chan dung
cong thuc » cong tac
thuc phan » thuc pham, thu phan, thuc chan
phan than » phan thanh, phan tan, khan than
dung dat » dung va, dung tai
dat cong » dai cong, dam cong, bat cong
than cap » khan cap, thanh lap, thanh cac

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