Perhaps you should try some spelling variations:
chat luc » chat xuc, chat lua, nhan luc
hieu cac » hieu luc, hieu va, hieu van
te sach » toc sach
hieu ca » hieu cua, hieu va, hieu xa
sach vu » sach va, sach tu, sach uu
dang xa » dang xay, lang xa, dang ha
vu dang » su dang, vu quang, cua dang
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
dao vi » dao voi, dao ve, dao li
dao va » dao van, tao va, do va

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 vu dang xa hoi. ((hieu cac) or (hieu ca)) chat luc va ((dao vi) OR (dao va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu dang xa hoi. ((hieu cac) OR (hieu ca)) chat luc va ((dao vi) OR (dao va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu dang xa hoi. ((hieu cac) or (hieu ca)) chat luc va ((dao vi) OR (dao va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach vu dang xa hoi. ((hieu cac) or (hieu ca)) chat luc va ((dao vi) OR (dao va)) cua tre*.