Perhaps you should try some spelling variations:
hieu tuc » hieu thuc, hieu luc, hieu thuoc
dinh tri » chinh tri
lang van » dang van, tang van, hoang van
cham luc » cham soc, nhan luc, cham cuu
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
hieu tu » chieu tu, hien tu, lieu tu
van hoe » van hoa, van hoc, van hieu
sach o » sach lo, sac o, sach y
luc va » duc va, tuc va, loc va
o lang » hoa lang, hoi lang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach o lang van hoe. ((hieu tu) OR (hieu tuc)) cham luc va ((hanh vi) OR (dinh tri)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach o lang van hoe. ((hieu tu) OR (hieu tuc)) cham luc va ((hanh vi) or (dinh tri)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach o lang van hoe. ((hieu tu) OR (hieu tuc)) cham luc va ((hanh vi) or (dinh tri)) cua tre*.