Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
van cac » van hac, van cau, van bac
cac tuc » cac toc, cac tu, cac tac
tuc ban » thuc ban, truc ban, tu ban
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ky ((lang xa) or (dang xay)) hoi. hieu van cac tuc ban thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky ((lang xa) OR (dang xay)) hoi. hieu van cac tuc ban thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu khach ky ((lang xa) or (dang xay)) hoi. hieu van cac tuc ban thanh vi cua tre*.