Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
trinh vi » trinh ve, trinh viet, trinh van
trinh va » trinh van, trinh vat, trinh ve
binh voi » binh hoi, minh voi, tinh voi
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang xa hoi. hieu va cac thuc va ((((trinh vi) or (trinh va))) or (binh voi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. hieu va cac thuc va ((((trinh vi) OR (trinh va))) OR (binh voi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. hieu va cac thuc va ((((trinh vi) or (trinh va))) or (binh voi)) cua tre*.