Perhaps you should try some spelling variations:
va thanh » ban thanh, va tinh, le thanh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va chai » va cai, va cham, va chi
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet
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. lieu ((va chai) or (va chat)) cuc ((va thanh) OR (gia thanh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. lieu ((va chai) OR (va chat)) cuc ((va thanh) OR (gia thanh)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. lieu ((va chai) or (va chat)) cuc ((va thanh) OR (gia thanh)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. lieu ((va chai) or (va chat)) cuc ((va thanh) OR (gia thanh)) va cua tre*.