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
cua tre » cua te, cuu tre, cua triet
vu dang » su dang, vu quang, cua dang
uu dang » huu dang, su dang, xu dang
luc ca » luc cao, luc cua, luc va
dao vi » dao voi, dao ve, dao va
vi cua » vai cua, di cua

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