Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vinh cua » sinh cua, tinh cua, dinh cua
va thanh » gia thanh, va tinh, le thanh
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
va cam » va cham, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky dang xa hoi. hieu ((va cam) or (va cac)) luc ((va thanh) OR (ban thanh)) vinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky dang xa hoi. hieu ((va cam) OR (va cac)) luc ((va thanh) OR (ban thanh)) vinh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky dang xa hoi. hieu ((va cam) or (va cac)) luc ((va thanh) OR (ban thanh)) vinh cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky dang xa hoi. hieu ((va cam) or (va cac)) luc ((va thanh) OR (ban thanh)) vinh cua tre*.