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

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 ((vien cac) or (hien dai)) 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 ((vien cac) OR (hien dai)) xuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu ((sach ly) or (sach tu)) lang xa hoi. hieu ((vien cac) or (hien dai)) xuc van hanh vi cua tre*.