Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hanh hoi » hanh thoi, hanh noi, hanh hoa
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
hieu ve » hieu va, hieu van
hoi cua » hoi chuc
ve tham » va tham, ve cham, vi tham
te sach » toc sach
sach ly » sach y, sach lo, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang ma, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet

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: te sach ly ((((nang xa) OR (lang xa))) OR (nang x)) hoi. hieu ve tham thuc day hanh hoi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly ((((nang xa) OR (lang xa))) or (nang x)) hoi. hieu ve tham thuc day hanh hoi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ly ((((nang xa) OR (lang xa))) or (nang x)) hoi. hieu ve tham thuc day hanh hoi cua tre*.