Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
vien cac » vien bach, vien dai, vien da
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
nang o » nang co, nang ho, nang ro
ve cac » va cac
o hai » co hai, so hai, o lai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang o hai. hieu ((ve cac) OR (vien cac)) duc van hanh thai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang o hai. hieu ((ve cac) OR (vien cac)) duc van hanh thai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang o hai. hieu ((ve cac) OR (vien cac)) duc van hanh thai cua tre*.