Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
van cac » van hac, van cau, van bac
cac toc » cac toi, cac nuoc, cac thoi
toc ban » toc san, toc ba, hoc ban
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ky ((nang xa) or (nang ma)) hoi. hieu van cac toc ban thanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky ((nang xa) OR (nang ma)) hoi. hieu van cac toc ban thanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: so sanh ky ((nang xa) or (nang ma)) hoi. hieu van cac toc ban thanh vi luu tre*.