Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
ban hang » ngan hang
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
xang xa » lang xa, mang xa, dang xay
cua tre » cua te, cuu tre, cua triet
ang xa » lang xa, mang xa, dang xay
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: tu sach thu ((xang xa) OR (ang xa)) hoi. hieu va cham soc ((van hanh) or (ban hang)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((xang xa) OR (ang xa)) hoi. hieu va cham soc ((van hanh) OR (ban hang)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((xang xa) OR (ang xa)) hoi. hieu va cham soc ((van hanh) or (ban hang)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((xang xa) OR (ang xa)) hoi. hieu va cham soc ((van hanh) or (ban hang)) vi cua tre*.