Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
cau tren » cu tren, dau tren, ca tren
dang cac » bang cac, dong cac, hang cac
dong tai » dung tai, luong tai, cong tac
dung cac » luong cac, dung cho, dung tai
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
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) OR (dung cac)) khoi. hieu ve cham thuc va dong tai ((cuu tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((dang cac) OR (dung cac)) khoi. hieu ve cham thuc va dong tai ((cuu tre) or (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((dang cac) OR (dung cac)) khoi. hieu ve cham thuc va dong tai ((cuu tre) or (cau tren))*.