Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thuoc ban » thuoc tan, thuoc dang, thu ban
nam thuoc » nam thuc, nam thu, nha thuoc
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
sach ky » sach y, sach ty, sach kem
nang xa » nang x, nang ma, mang xa
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

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