Perhaps you should try some spelling variations:
hanh dieu » han dieu, hinh dieu, hoang dieu
van cham » van chat, van tham, va cham
dieu tra » dieu tri, kiem tra, dieu cua
buoc ban » quoc ban, buon ban, duoc ban
luoc ban » luoc can, quoc ban, duoc ban
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
tra tre » tran tren, tran tri, tran tro
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: te ((sach ky) or (sach ty)) nang x hoi. hieu van cham ((luoc ban) OR (buoc ban)) hanh dieu tra tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang x hoi. hieu van cham ((luoc ban) OR (buoc ban)) hanh dieu tra tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach ty)) nang x hoi. hieu van cham ((luoc ban) OR (buoc ban)) hanh dieu tra tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach ty)) nang x hoi. hieu van cham ((luoc ban) OR (buoc ban)) hanh dieu tra tre*.