Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
sach ky » sach y, sach ty, sach kem
tai cua » thai cua, tai cuc, tri cua
xuc van » duc van, luc van, xuc ban
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang ho » nang hoc, nang co, tang ho
ve cac » va cac, vien cac
nang o » nang co, nang ro, nang x
sac ky » cac ky, sai ky

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: su ((sach ky) OR (sac ky)) ((nang o) OR (nang ho)) hoi. hieu ve cac xuc van hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) ((nang o) or (nang ho)) hoi. hieu ve cac xuc van hanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) ((nang o) or (nang ho)) hoi. hieu ve cac xuc van hanh tai cua tre*.