Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hang » ngan hang
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
cac lo » cac lop, cac co, cac bo
me hoi » le hoi
vi cua » vai cua, di cua
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ((me hoi) or (ma hoa)). hieu ve cac lo ((ban hanh) or (ban hang)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((me hoi) OR (ma hoa)). hieu ve cac lo ((ban hanh) OR (ban hang)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((me hoi) or (ma hoa)). hieu ve cac lo ((ban hanh) or (ban hang)) vi cua tre*.