Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
vien cua » dien cua, tien cua, bien cua
va chai » va cai, va chat, va cham
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va hai » van hai, va khai, va bai
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach v nang x hoi. lieu ((va hai) or (va chai)) duc va thanh ((vien cua) OR (viec cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach v nang x hoi. lieu ((va hai) OR (va chai)) duc va thanh ((vien cua) OR (viec cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach v nang x hoi. lieu ((va hai) or (va chai)) duc va thanh ((vien cua) OR (viec cua)) triet".
• Adding a wildcard symbol may retrieve word variants: hoc sach v nang x hoi. lieu ((va hai) or (va chai)) duc va thanh ((vien cua) OR (viec cua)) triet*.