Perhaps you should try some spelling variations:
ban hanh » ban hang
sach thu » sach thue, sach thieu, sach tham
lang van » dang van, tang van, hoang van
va tham » van tham, va cham, va thanh
sach ty » sach y, sach tu, xach tay
van hoi » van hoa, van hoc, van hoe
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
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: thuat ((sach ty) OR (sach thu)) lang van hoi. hieu ((ve cam) or (va tham)) cua ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ty) OR (sach thu)) lang van hoi. hieu ((ve cam) OR (va tham)) cua ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ty) OR (sach thu)) lang van hoi. hieu ((ve cam) or (va tham)) cua ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ty) OR (sach thu)) lang van hoi. hieu ((ve cam) or (va tham)) cua ban hanh vi cua tre*.