Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh doi » thanh loi, thanh moi, thanh do
hieu van » hieu va, thien van, lieu va
nang xa » lang xa, nang ma, mang xa
thu ban » thu hang
doi cua » dai cua, hoi cua
san ky » sang ky, van ky, dan ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc san ky ((nang xa) or (nang x)) hoi. hieu van nam thu ban thanh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc san ky ((nang xa) OR (nang x)) hoi. hieu van nam thu ban thanh doi cua te.
• Adding a wildcard symbol may retrieve word variants: toc san ky ((nang xa) or (nang x)) hoi. hieu van nam thu ban thanh doi cua te*.