Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
doanh van » doan van, doanh va, doanh ban
doanh dan » doanh ban, doanh dao, doanh doanh
van bach » van bac, van hach, van sach
hieu van » hieu va, thien van, lieu va
tuoc va » thuoc va, nuoc va, duoc va
sach ky » sach y, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky

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: te ((sach ky) OR (sac ky)) lang xa hoi. hieu van bach tuoc va ((doanh dan) OR (doanh van)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sac ky)) lang xa hoi. hieu van bach tuoc va ((doanh dan) OR (doanh van)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) lang xa hoi. hieu van bach tuoc va ((doanh dan) OR (doanh van)) cuu tre*.