Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, va tinh, le thanh
cam tuc » cam xuc, cam tu, nam thuc
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
hieu va » hieu qua
vang xa » lang xa, mang xa, ang xa
ly vang » ly hang, ly van, ly quang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ly vang xa hoi. ((hieu va) or (lieu va)) cam tuc ((va thanh) OR (ban thanh)) van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly vang xa hoi. ((hieu va) OR (lieu va)) cam tuc ((va thanh) OR (ban thanh)) van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ly vang xa hoi. ((hieu va) or (lieu va)) cam tuc ((va thanh) OR (ban thanh)) van cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ly vang xa hoi. ((hieu va) or (lieu va)) cam tuc ((va thanh) OR (ban thanh)) van cua tre*.