Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » vu sach
cau tuc » cau truc, cau tu, cau luc
van cau » van dau, van hau, van chat
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
ca tren » cau tren, cu tren, la tren
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
hai ca » hai cua, hai ba, bai ca

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang ma hoi. hieu van cau tuc ((va dan) OR (ca dan)) hai ca tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang ma hoi. hieu van cau tuc ((va dan) OR (ca dan)) hai ca tren~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang ma hoi. hieu van cau tuc ((va dan) OR (ca dan)) hai ca tren*.