Perhaps you should try some spelling variations:
vien dai » hien dai
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
tai cua » thai cua, tai cuc, tri cua
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang xa hoi. hieu ((((ve cam) OR (ve cac))) or (vien dai)) xuc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu ((((ve cam) OR (ve cac))) OR (vien dai)) xuc van hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu ((((ve cam) OR (ve cac))) or (vien dai)) xuc van hanh tai cua tre*".