Perhaps you should try some spelling variations:
hanh hoi » hanh thoi, hanh noi, hanh hoa
ban hanh » ban hang
quoc ban » quoc bao, quoc lan, quoc quan
cau quoc » cac quoc, cao quoc, han quoc
hieu van » thien van, lieu va, hieu ve
hieu va » lieu va, hieu qua
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) lang xa hoi. ((hieu van) or (hieu va)) cau quoc ban hanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) lang xa hoi. ((hieu van) OR (hieu va)) cau quoc ban hanh hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) lang xa hoi. ((hieu van) or (hieu va)) cau quoc ban hanh hoi cua tre*.