Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van tham » van thanh, van tuan, van chat
tham soc » cham soc, tham nuoc, thai son
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, va tinh, le thanh
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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) OR (toc sach)) ky lang xa hoi. hieu van tham soc ((va thanh) OR (ban thanh)) vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky lang xa hoi. hieu van tham soc ((va thanh) OR (ban thanh)) vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky lang xa hoi. hieu van tham soc ((va thanh) OR (ban thanh)) vi cuu tre*.