Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sang tao » hang tai
va doanh » van doanh, vay doanh, va danh
tai cuu » tai cuc, tai buu, tai cua
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
cuu tre » cua tre, cau tren, cau treo
ve cac » vien cac
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky ((sang tao) or (tang ma)) hoi. hieu ((ve cac) OR (va cac)) xuc va doanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky ((sang tao) OR (tang ma)) hoi. hieu ((ve cac) OR (va cac)) xuc va doanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky ((sang tao) or (tang ma)) hoi. hieu ((ve cac) OR (va cac)) xuc va doanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky ((sang tao) or (tang ma)) hoi. hieu ((ve cac) OR (va cac)) xuc va doanh tai cuu tre*.