Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
dong tai » dung tai, luong tai, cong tac
cau tren » cu tren, dau tren, cau treo
dang cac » dung cac, bang cac, dong cac
cac khoi » cac thoi, cac khoan, cach thoi
ca tren » cu tren, la tren, co tren
cuu tre » cua tre, cau treo
va dong » van dong, ha dong, xa dong
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky dang cac khoi. hieu ve cham thuc va dong tai ((cuu tre) OR (((cau tren) OR (ca tren))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky dang cac khoi. hieu ve cham thuc va dong tai ((cuu tre) or (((cau tren) OR (ca tren))))~".
• Adding a wildcard symbol may retrieve word variants: su sac ky dang cac khoi. hieu ve cham thuc va dong tai ((cuu tre) or (((cau tren) OR (ca tren))))*.