Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van tuan » van quan, van ban, anh tuan
hieu van » hieu va, thien van, lieu va
luc van » luoc van, luu van, duc van
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
sach v » sach va, sach y, sach 2
ma hoi » mai hoi, ma hoa, me hoi
v nang » va nang, vu nang, van nang
le cua » ly cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach v nang ((ma hoi) or (xa hoi)). ((hieu ve) OR (hieu van)) cau luc van tuan le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach v nang ((ma hoi) OR (xa hoi)). ((hieu ve) OR (hieu van)) cau luc van tuan le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach v nang ((ma hoi) or (xa hoi)). ((hieu ve) OR (hieu van)) cau luc van tuan le cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach v nang ((ma hoi) or (xa hoi)). ((hieu ve) OR (hieu van)) cau luc van tuan le cua tre*.