Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dinh tri » chinh tri
tang xa » trang xa, tang ma, lang xa
nam xuc » cam xuc, nam xua, nam thuc
dinh vi » dinh ve, dinh viet, dinh thi
cua tre » cua te, cuu tre, cua triet
bai ky » ban ky, sai ky, dai ky
bac ky » cac ky, ban ky, sac ky
xuc va » duc va, tuc 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: te ((bai ky) OR (bac ky)) tang xa hoi. hieu van nam xuc va ((dinh vi) or (dinh tri)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((bai ky) OR (bac ky)) tang xa hoi. hieu van nam xuc va ((dinh vi) OR (dinh tri)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((bai ky) OR (bac ky)) tang xa hoi. hieu van nam xuc va ((dinh vi) or (dinh tri)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((bai ky) OR (bac ky)) tang xa hoi. hieu van nam xuc va ((dinh vi) or (dinh tri)) cua tre*.