Perhaps you should try some spelling variations:
ninh viet » sinh vien, anh viet
quy ninh » quy dinh, qua ninh, quy trinh
te sach » toc sach
cua tre » cuu tre, cua triet, dua tren
duc quy » duc duy, duc huy, duy quy
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
ty nang » ky nang, ty xang, ty hang
ve cac » va cac, vien cac
ma hoi » xa hoi, ma hoa, me hoi
cua te » cua tu

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 nang ((ma hoi) OR (mai hoi)). hieu ve cac duc quy ninh viet ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((ma hoi) OR (mai hoi)). hieu ve cac duc quy ninh viet ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((ma hoi) OR (mai hoi)). hieu ve cac duc quy ninh viet ((cua tre) or (cua te))*".