Perhaps you should try some spelling variations:
cuon sach » duong sach, cuoc cach, co sach
thanh vai » thanh hai, thanh van, thanh tai
su sach » so sach, vu sach
vai cuu » vai cua
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, duc va

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 (cuon sach)) ty nang xa hoi. hieu va cham ((tuc va) OR (tuc xa)) thanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (cuon sach)) ty nang xa hoi. hieu va cham ((tuc va) OR (tuc xa)) thanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (cuon sach)) ty nang xa hoi. hieu va cham ((tuc va) OR (tuc xa)) thanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (cuon sach)) ty nang xa hoi. hieu va cham ((tuc va) OR (tuc xa)) thanh vai cuu tre*.