Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
van hau » van ha, van hai, van dau
van cau » van dau, van chat, toan cau
te sach » toc sach
nang co » nang cao, nang doc, nang noi
hang co » hang cho, hang ca, lang co
cua tre » cua te, cuu tre, cua triet
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 thu ((hang co) or (nang co)) loi. hieu ((van cau) OR (van hau)) thuc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu ((hang co) OR (nang co)) loi. hieu ((van cau) OR (van hau)) thuc ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu ((hang co) or (nang co)) loi. hieu ((van cau) OR (van hau)) thuc ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach thu ((hang co) or (nang co)) loi. hieu ((van cau) OR (van hau)) thuc ban hanh vi cua tre*.