Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
qua chao » qua cham, qua cho, qua khao
va thanh » gia thanh, ban thanh, va tinh
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hoa hoi » khoa hoi, hoa hoc, hoa doi
va hanh » van hanh, va danh, ban hanh
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: toc sach ((ky lang) or (ky dang)) hoa hoi. hieu qua chao xu ((va thanh) or (va hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky dang)) hoa hoi. hieu qua chao xu ((va thanh) OR (va hanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) or (ky dang)) hoa hoi. hieu qua chao xu ((va thanh) or (va hanh)) vi cua tre*.