Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
hanh doi » thanh doi, hanh noi, hang doi
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
co sach » bo sach, cuon sach, hoc sach
cua tre » cuu tre, cua triet, dua tren
mang xa » lang xa, mang may, dang xay
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
sach v » sach va, sach y, sach 2
cua te » cua tu

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