Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
hai cua » thai cua, dai cua, hoi cua
nam tuc » nam thuc, nam truc, nam tu
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, 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) OR (hoc sach)) ((ky lang) or (ky dang)) 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) OR (hoc sach)) ((ky lang) OR (ky dang)) 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) OR (hoc sach)) ((ky lang) or (ky dang)) xa hoi. hieu van nam tuc va thanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ((ky lang) or (ky dang)) xa hoi. hieu van nam tuc va thanh hai cua te*.