Perhaps you should try some spelling variations:
ninh viet » sinh vien, anh viet
hoc sach » hoc sinh, hoc cac, hoc anh
ty nano » tu nano, day nano, tao nano
nano xa » nano va, nano bac, nano cau
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
dinh vi » dinh ve, dinh viet, dinh tri
cua te » cua tu
luc va » duc va, tuc va, loc va
xuc va » duc va, tuc va, xac va
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ty nano xa hoi. hieu ve cam ((xuc va) OR (luc va)) ((dinh vi) or (ninh viet)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty nano xa hoi. hieu ve cam ((xuc va) OR (luc va)) ((dinh vi) OR (ninh viet)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ty nano xa hoi. hieu ve cam ((xuc va) OR (luc va)) ((dinh vi) or (ninh viet)) cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nano xa hoi. hieu ve cam ((xuc va) OR (luc va)) ((dinh vi) or (ninh viet)) cua te*.