Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cac thuc » cach thuc, cac thu, can thuc
thuc gia » thuc giai, thue gia, thuc dia
thanh vi » hanh vi, thanh va, thanh ve
so sach » so sanh, bo sach
co sach » bo sach, cuon sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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) or (((co sach) OR (hoc sach)))) ky nang xa hoi. hieu va cac thuc gia thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (((co sach) OR (hoc sach)))) ky nang xa hoi. hieu va cac thuc gia thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (((co sach) OR (hoc sach)))) ky nang xa hoi. hieu va cac thuc gia thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (((co sach) OR (hoc sach)))) ky nang xa hoi. hieu va cac thuc gia thanh vi cua tre*.