Perhaps you should try some spelling variations:
hoc thieu » hoc hien
cong thuc » cong tac
dung benh » duong benh, dung menh, trung benh
benh phan » benh nhan, benh phau, kenh phan
thuc van » thuc vat, thuc dan, thuc va
van dung » van dong, xay dung, tin dung
phan cac » nhan cach, phan dau, phan lap

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)) tinh - thanh cong thuc van dung benh phan cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) OR (toc thieu)) tinh - thanh cong thuc van dung benh phan cac".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) OR (toc thieu)) tinh - thanh cong thuc van dung benh phan cac*.