Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van bac » van bao, van hac, dan bac
van cau » van dau, van hau, van chat
dan ban » can ban, dan ba, dan bac
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. thien ((van bac) or (van cau)) ((dan ban) OR (van ban)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. thien ((van bac) OR (van cau)) ((dan ban) OR (van ban)) thanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. thien ((van bac) or (van cau)) ((dan ban) OR (van ban)) thanh vai cua tre*".