Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
ban hanh » ban hang
va thanh » gia thanh, ban thanh, va tinh
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
cua tre » cua te, cuu tre, cua triet
ve cac » va cac

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