Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
xuc van » duc van, luc van, xuc ban
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
sach tu » sach thu, cach tu, sach ty
vi cua » vai cua, di cua
ve cac » va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ly) or (sach tu)) lang xa hoi. hieu ((ve cac) OR (vien cac)) xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ly) OR (sach tu)) lang xa hoi. hieu ((ve cac) OR (vien cac)) xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ly) or (sach tu)) lang xa hoi. hieu ((ve cac) OR (vien cac)) xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ly) or (sach tu)) lang xa hoi. hieu ((ve cac) OR (vien cac)) xuc van hanh vi cua tre*.