Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
so sanh » do sanh
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
tinh ve » trinh ve, tinh ven, dinh ve
su tien » su kien, su hien, tu tieng
sanh y » sinh y, anh y, hanh y
y xang » ty xang
xang o » lang o, tang o, dang o
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai
ve su » va su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh y xang o hoi. hieu ve cac thuc va tinh ve su tien~.
• Adding a wildcard symbol may retrieve word variants: so sanh y xang o hoi. hieu ve cac thuc va tinh ve su tien*.