Perhaps you should try some spelling variations:
giau cua » gian cua, gia cua, dieu cua
tu sach » thu sach, su sach, te sach
ky dang » ky danh
hieu ve » hieu va, hieu van
van anh » van thanh, van minh
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
cac vo » cac co, cac vi, cac bo
tuan » quan, tran, luan

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