Perhaps you should try some spelling variations:
ninh viet » sinh vien, anh viet
danh viet » anh viet, nang viet, dao viet
dinh viet » trinh viet, sinh vien, dinh ket
toc sach » hoc sach, doc sach, thuoc sach
cua tre » cua te, cuu tre, cua triet
cac dac » cac dan, cac dai, cac bac
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
y tang » ky tang, 6 tang, 7 tang
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
dac va » duc va, day va, dat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y tang ma hoi. hieu ve cac dac va ((dinh viet) or (((danh viet) OR (ninh viet)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y tang ma hoi. hieu ve cac dac va ((dinh viet) OR (((danh viet) OR (ninh viet)))) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y tang ma hoi. hieu ve cac dac va ((dinh viet) or (((danh viet) OR (ninh viet)))) cua tre*".