Perhaps you should try some spelling variations:
thien van » thi van
van phan » van phong, van thanh, luan phan
hanh vai » hanh va, hanh tai, hanh van
phan duc » pham duc, phan tu, phan dau
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
tu bai » tu ban, tu bat, te bai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ((ky lang) OR (ky tang)) xa hoi. thien van phan duc ban ((hanh vai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ((ky lang) OR (ky tang)) xa hoi. thien van phan duc ban ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ((ky lang) OR (ky tang)) xa hoi. thien van phan duc ban ((hanh vai) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu bai ((ky lang) OR (ky tang)) xa hoi. thien van phan duc ban ((hanh vai) or (hanh vi)) cua tre*.