Perhaps you should try some spelling variations:
sach cao » sach dao, mach cao, sach bao
sach cap » sach dao, sach bai, sach xa
va thanh » gia thanh, ban thanh, va tinh
thanh ve » hanh ve, thanh va, thanh vien
tang xa » trang xa, tang ma, lang xa
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va
ve cuu » ve cau, ve chu, ve 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 cao) OR (sach cap)) tang xa hoi. hieu ((van nam) or (van lam)) xuc va thanh ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach cao) OR (sach cap)) tang xa hoi. hieu ((van nam) OR (van lam)) xuc va thanh ve cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach cao) OR (sach cap)) tang xa hoi. hieu ((van nam) or (van lam)) xuc va thanh ve cuu tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach cao) OR (sach cap)) tang xa hoi. hieu ((van nam) or (van lam)) xuc va thanh ve cuu tre*.