Perhaps you should try some spelling variations:
dong hoa » dong hoc, dong co
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
lam co » nam co
lam lo » nam lo, cam lo, lam so

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((dong hoa) OR (van xay)) hoi. hieu van ((lam lo) OR (lam co)) van hanh vai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((dong hoa) or (van xay)) hoi. hieu van ((lam lo) OR (lam co)) van hanh vai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((dong hoa) or (van xay)) hoi. hieu van ((lam lo) OR (lam co)) van hanh vai cuu tre*.