Perhaps you should try some spelling variations:
thien van » thi van
hanh vai » hanh va, hanh tai, hanh van
tu sach » thu sach, su sach, te sach
ky dang » ky nang, ky danh
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
y dang » 2 dang, _ dang, b dang
xuc va » duc va, tuc va, luc va

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 dang) OR (ky dang)) mai hoi. thien van cam xuc va ((hanh vai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y dang) OR (ky dang)) mai hoi. thien van cam xuc va ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y dang) OR (ky dang)) mai hoi. thien van cam xuc va ((hanh vai) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y dang) OR (ky dang)) mai hoi. thien van cam xuc va ((hanh vai) or (hanh vi)) cua tre*.