Perhaps you should try some spelling variations:
sach kho » bach khoa, sach dao, sach nha
kho tang » cao tang
va thanh » ban thanh, va tinh, le thanh
vu sach » vu bach, su sach, vu khach
tang xa » trang xa, tang ma, lang xa
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 kho tang xa hoi. hieu ((van nam) or (van lam)) luc ((va thanh) OR (gia thanh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach kho tang xa hoi. hieu ((van nam) OR (van lam)) luc ((va thanh) OR (gia thanh)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach kho tang xa hoi. hieu ((van nam) or (van lam)) luc ((va thanh) OR (gia thanh)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach kho tang xa hoi. hieu ((van nam) or (van lam)) luc ((va thanh) OR (gia thanh)) va cua tre*.