Perhaps you should try some spelling variations:
sach vaya » sach va, sach hay, sach nay
sach vay » sach va, sach hay, sach nay
van hanh » van thanh, ban hanh, van anh
tang van » dang van, hoang van, trong van
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
van hoi » van hoa, van hoc, van hoe
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
vi cua » vai cua, di cua

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 vay) or (sach vaya)) tang van hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach vay) OR (sach vaya)) tang van hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach vay) or (sach vaya)) tang van hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach vay) or (sach vaya)) tang van hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh vi cua tre*.