Perhaps you should try some spelling variations:
cam thuc » nam thuc, cam thu, can thuc
su sach » so sach, vu sach
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v nang xa hoi. hieu ve ((cam thuc) OR (am thuc)) day ((hanh di) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. hieu ve ((cam thuc) OR (am thuc)) day ((hanh di) OR (hanh de)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. hieu ve ((cam thuc) OR (am thuc)) day ((hanh di) or (hanh de)) cua tre*".