Perhaps you should try some spelling variations:
ninh viet » sinh vien, anh viet
danh viet » anh viet, nang viet, dao viet
te sach » toc sach
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
mai hoi » mai khoi, dai hoi, lai hoi
qua tre » cua tre, quan tren, quan tri
ve cac » va cac, vien cac
ma hoi » xa hoi, ma hoa, me hoi

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

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