Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ve cac » va cac
va cua » va chua, via cua, ca cua

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