Perhaps you should try some spelling variations:
ninh viet » sinh vien, anh viet
viet cua » viec cua, viet ca, viet qua
vien cac » vien bach, vien dai, vien da
te sach » toc sach
sach ty » sach y, sach tu, sach thu
va ninh » van ninh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac
dac va » duc va, day va, dat va
ma hoi » mai hoi, xa hoi, 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 (ma hoa)). hieu ((ve cac) or (vien cac)) dac va ninh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang ((ma hoi) OR (ma hoa)). hieu ((ve cac) OR (vien cac)) dac va ninh viet cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty xang ((ma hoi) OR (ma hoa)). hieu ((ve cac) or (vien cac)) dac va ninh viet cua tre*".