Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
dan vat » dang vat, van vat, dan va
dan vai » dan va, dan tai, den vai
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
xuc va » duc va, tuc va, xac va
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ma hoi. hieu ve cac ((xuc va) or (luc va)) ((dan vai) or (dan vat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ma hoi. hieu ve cac ((xuc va) OR (luc va)) ((dan vai) OR (dan vat)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ma hoi. hieu ve cac ((xuc va) or (luc va)) ((dan vai) or (dan vat)) cua tre*.