Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
xuc tuan » duc thuan, quoc tuan, xuan tuan
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
anh vi » anh va, anh ve, anh vu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty ((nang ma) or (van xay)) hoi. hieu ve cac xuc tuan ((anh vi) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty ((nang ma) OR (van xay)) hoi. hieu ve cac xuc tuan ((anh vi) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ty ((nang ma) or (van xay)) hoi. hieu ve cac xuc tuan ((anh vi) or (hanh vi)) cua tre*.