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