Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
kho tang » cao tang
hai cua » thai cua, dai cua, hoi cua
nam tuc » nam thuc, nam truc, nam tu
ky tang » ky nang, ky dang, ky trong
ky lang » ky nang, ky dang, tay lang
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky lang) or (((ky tang) OR (kho tang)))) xa hoi. hieu van nam tuc va thanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (((ky tang) OR (kho tang)))) xa hoi. hieu van nam tuc va thanh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) or (((ky tang) OR (kho tang)))) xa hoi. hieu van nam tuc va thanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) or (((ky tang) OR (kho tang)))) xa hoi. hieu van nam tuc va thanh hai cua te*.