Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cac thuc » cach thuc, cac thu, can thuc
day danh » day manh, dai danh, day dan
dao danh » dao doanh, do danh, dao dan
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang xa hoi. hieu ve cac thuc ((day danh) OR (dao danh)) dau cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. hieu ve cac thuc ((day danh) OR (dao danh)) dau cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu ve cac thuc ((day danh) OR (dao danh)) dau cua tre*.