Perhaps you should try some spelling variations:
ban tinh » ban thanh, quan tinh, ban hanh
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
tinh vi » trinh vi, tinh voi, tinh va
cuu ban » cuu van, cua ban, cuu san
cam cuu » cham cuu, cap cuu
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
long ha » dong ha, cong ha, dong hoa
y long » sy long, _ long, o long
ha hoi » hoa hoi, ha noi, xa hoi
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 y long ha hoi. ((((hieu ve) OR (hieu va))) or (lieu va)) cam cuu ban tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y long ha hoi. ((((hieu ve) OR (hieu va))) OR (lieu va)) cam cuu ban tinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y long ha hoi. ((((hieu ve) OR (hieu va))) or (lieu va)) cam cuu ban tinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y long ha hoi. ((((hieu ve) OR (hieu va))) or (lieu va)) cam cuu ban tinh vi cua tre*.