Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
va danh » va dinh, va dan, va hanh
cho cuu » cho chu, cho cu, cho cua
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
me hoi » le hoi
tac va » tac da, tac xa, tuc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) y nang ((me hoi) or (ma hoa)). hieu va cac tac va danh cho cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang ((me hoi) OR (ma hoa)). hieu va cac tac va danh cho cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang ((me hoi) or (ma hoa)). hieu va cac tac va danh cho cuu tre*".