Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang ma » tang ma, sang ma, nang cao
va tinh » may tinh
hoi cuu » hoi chu, hoi cua, ho cuu
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cao, va cai

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 y nang ma hoi. hieu ((va cam) OR (va cac)) tuc ((va tinh) or (gia thanh)) hoi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. hieu ((va cam) OR (va cac)) tuc ((va tinh) OR (gia thanh)) hoi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoi. hieu ((va cam) OR (va cac)) tuc ((va tinh) or (gia thanh)) hoi cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoi. hieu ((va cam) OR (va cac)) tuc ((va tinh) or (gia thanh)) hoi cuu tre*.