Perhaps you should try some spelling variations:
sach cao » sach dao, sach cap, mach cao
cao tang » cao dang
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
cau treo » cau theo, cau tren, cau triet
vu sach » vu bach, su sach, vu khach
tang xa » trang xa, tang ma, lang xa
cuu tre » cua tre, cau tren
xuc va » duc va, tuc va, luc va

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 cao tang xa hoi. hieu ((van nam) or (van lam)) xuc va thanh vi ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach cao tang xa hoi. hieu ((van nam) OR (van lam)) xuc va thanh vi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach cao tang xa hoi. hieu ((van nam) or (van lam)) xuc va thanh vi ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: vu sach cao tang xa hoi. hieu ((van nam) or (van lam)) xuc va thanh vi ((cuu tre) OR (cau treo))*.