Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dieu tra » dieu tri, kiem tra, dieu cua
van cham » van chat, van tham, va cham
te sach » toc sach
da nang » cam nang, kha nang, cao nang
va nang » van nang, cam nang, kha nang
soc va » hoc va, loc va, doc va
luc va » duc va, tuc va, loc va
tra te » tra tu

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 ((va nang) OR (da nang)) xa hoi. hieu van cham ((soc va) or (luc va)) dang dieu tra te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((va nang) OR (da nang)) xa hoi. hieu van cham ((soc va) OR (luc va)) dang dieu tra te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((va nang) OR (da nang)) xa hoi. hieu van cham ((soc va) or (luc va)) dang dieu tra te".
• Adding a wildcard symbol may retrieve word variants: te sach ((va nang) OR (da nang)) xa hoi. hieu van cham ((soc va) or (luc va)) dang dieu tra te*.