Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
nam tuc » nam thuc, nam truc, nam tu
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tu sach » te sach, tu cach, vu sach
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa

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

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