Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
qua cac » cua cac
cua tre » cua te, cuu tre, cua triet
me hoi » le hoi
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
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: ((thu sach) OR (thuoc sach)) y nang ((me hoi) OR (ma hoa)). hieu qua cac tuc va hanh ca cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) y nang ((me hoi) OR (ma hoa)). hieu qua cac tuc va hanh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) y nang ((me hoi) OR (ma hoa)). hieu qua cac tuc va hanh ca cua tre*.