Perhaps you should try some spelling variations:
ninh viet » sinh vien, anh viet
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
quy ninh » quy dinh, qua ninh, quy trinh
cua tre » cuu tre, cua triet, dua tren
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
du quy » dau quy, duc quy, duy quy
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: ((toc sach) OR (hoc sach)) ty nang ma hoi. hieu ve cac du quy ninh viet ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ty nang ma hoi. hieu ve cac du quy ninh viet ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ty nang ma hoi. hieu ve cac du quy ninh viet ((cua tre) or (cua te))*".