Perhaps you should try some spelling variations:
cam thuc » nam thuc, can thuc, cay thuc
su sach » so sach, vu sach
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
cam thu » nam thu, cac thu, ca thu
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va cua » va chua, via cua, ca cua

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 ty nang xa hoi. hieu ve ((((cam thuc) OR (cam thu))) or (am thuc)) va tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ve ((((cam thuc) OR (cam thu))) OR (am thuc)) va tinh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu ve ((((cam thuc) OR (cam thu))) or (am thuc)) va tinh va cua tre*".