Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
chon loc » cho hoc
dinh vi » dinh ve, dinh viet, dinh tri
danh vi » hanh vi, danh di, danh va
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang xa hoi. ((hieu ve) or (hieu van)) chon loc va ((danh vi) OR (dinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. ((hieu ve) OR (hieu van)) chon loc va ((danh vi) OR (dinh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. ((hieu ve) or (hieu van)) chon loc va ((danh vi) OR (dinh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. ((hieu ve) or (hieu van)) chon loc va ((danh vi) OR (dinh vi)) cua tre*.