Perhaps you should try some spelling variations:
ninh viet » sinh vien, anh viet
dinh viet » danh viet, trinh viet, sinh vien
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
qua tre » cua tre, quan tren, quan tri
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac

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: toc sach ty nang ma hoi. hieu ve cac duc va ((dinh viet) OR (ninh viet)) qua tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ma hoi. hieu ve cac duc va ((dinh viet) or (ninh viet)) qua tre*.