Perhaps you should try some spelling variations:
banh hai » lanh hai, manh hai, bang hai
ban banh » ban hanh, ban anh, ban danh
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky danh
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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 ((ky dang) or (ky nang)) tay hoi. hieu ((ve cam) OR (ve cac)) duc ban banh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky dang) OR (ky nang)) tay hoi. hieu ((ve cam) OR (ve cac)) duc ban banh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky dang) or (ky nang)) tay hoi. hieu ((ve cam) OR (ve cac)) duc ban banh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) or (ky nang)) tay hoi. hieu ((ve cam) OR (ve cac)) duc ban banh hai cua tre*.