Perhaps you should try some spelling variations:
thanh thai » thanh tai, nhanh thai, thanh thao
thanh hai » thanh phan, thanh hoa, thanh san
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
cam duc » cao duc, pham duc, nam duoc
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang

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 ky tang xa hoi. hieu ve ((cam duc) or (cam xuc)) minh ((thanh thai) OR (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang xa hoi. hieu ve ((cam duc) OR (cam xuc)) minh ((thanh thai) OR (thanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang xa hoi. hieu ve ((cam duc) or (cam xuc)) minh ((thanh thai) OR (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang xa hoi. hieu ve ((cam duc) or (cam xuc)) minh ((thanh thai) OR (thanh hai)) cua tre*.