Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
cac tac » cac toc, cac bac, cac dac
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
y nang » ky nang, ly nang, v nang
tac va » tac da, tac xa, tuc va
me hoi » le hoi
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang ((me hoi) or (ma hoa)). ((hieu va) or (hieu qua)) cac tac va hanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang ((me hoi) OR (ma hoa)). ((hieu va) OR (hieu qua)) cac tac va hanh ca cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ((me hoi) or (ma hoa)). ((hieu va) or (hieu qua)) cac tac va hanh ca cua tre*.