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 vi » trinh vi, tinh voi, tinh va
su tien » su kien, su hien, tu tieng
sanh y » sinh y, anh y, hanh y
y tang » ky tang, 6 tang, 7 tang
tang o » trang o, lang o
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai
vi su » va su, ve su, ki 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 tang o hoi. hieu ve cac thuc va tinh vi su tien~.
• Adding a wildcard symbol may retrieve word variants: so sanh y tang o hoi. hieu ve cac thuc va tinh vi su tien*.