Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
sach ky » sac ky, sach y, sach ty
qua cam » qua cham, qua cac, qua ca
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ha hoi » ha noi, xa hoi, va hoi
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: hoc sach ky lang ((ha hoi) or (hoa hoi)). hieu qua cam xuc ((va hanh) or (va danh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky lang ((ha hoi) OR (hoa hoi)). hieu qua cam xuc ((va hanh) OR (va danh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang ((ha hoi) or (hoa hoi)). hieu qua cam xuc ((va hanh) or (va danh)) vi cua tre*.