Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dieu tra » dieu tri, kiem tra
cao luc » bao luc, cao duc, cao suc
va dang » van dang, va nang, va lang
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
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: hoc sach y nang x hoi. lieu va cao luc va dang ((dieu cua) or (dieu tra)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang x hoi. lieu va cao luc va dang ((dieu cua) OR (dieu tra)) tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang x hoi. lieu va cao luc va dang ((dieu cua) or (dieu tra)) tre*.