Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
vi cua » vai cua, di cua
xuc va » duc va, tuc va, luc va
cua te » cua tu
ve cac » va cac, vien cac
y nano » day nano
ve cam » ve cham, va cam, ve cai
_ nano » _ nao

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 ((y nano) or (_ nano)) xa hoi. hieu ((ve cam) OR (ve cac)) xuc va dinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((y nano) OR (_ nano)) xa hoi. hieu ((ve cam) OR (ve cac)) xuc va dinh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((y nano) or (_ nano)) xa hoi. hieu ((ve cam) OR (ve cac)) xuc va dinh vi cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((y nano) or (_ nano)) xa hoi. hieu ((ve cam) OR (ve cac)) xuc va dinh vi cua te*.