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

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: co sach ky ((dong hoa) OR (van xay)) hoi. hieu van lam lo van ((hanh va) OR (hang va)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky ((dong hoa) or (van xay)) hoi. hieu van lam lo van ((hanh va) OR (hang va)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: co sach ky ((dong hoa) or (van xay)) hoi. hieu van lam lo van ((hanh va) OR (hang va)) cuu tre*.