Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
dinh cua » dinh cuu, sinh cua, dinh cu
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
sac ky » sai ky
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (cac ky)) nang x hoi. hieu van cac xuc ((van hanh) OR (ban hanh)) dinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) nang x hoi. hieu van cac xuc ((van hanh) OR (ban hanh)) dinh cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (cac ky)) nang x hoi. hieu van cac xuc ((van hanh) OR (ban hanh)) dinh cua tre*".