Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dang xay » van xay
van dinh » van minh, van dich, va dinh
dang van » hoang van, hang va
vu dinh » quy dinh
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
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: hoc sach tu ((dang xay) OR (dang van)) hoi. hieu va cam xuc ((vu dinh) or (van dinh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach tu ((dang xay) OR (dang van)) hoi. hieu va cam xuc ((vu dinh) OR (van dinh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach tu ((dang xay) OR (dang van)) hoi. hieu va cam xuc ((vu dinh) or (van dinh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach tu ((dang xay) OR (dang van)) hoi. hieu va cam xuc ((vu dinh) or (van dinh)) vi cua te*.