Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
cua thuoc » nha thuoc, cay thuoc, cua nuoc
ban thanh » ban hanh, ban hang
thanh ve » hanh ve, thanh va, thanh vien
hieu van » hieu va, thien van, lieu va
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
bach ty » xach tay, bach thu
hang ca » hang va, nang cao, hang tai
sach ty » sach y, sach tu, sach thu
van cam » van nam, van lam, van cau
ca hoi » cau hoi, cua hoi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((bach ty) OR (sach ty)) hang ca hoi. hieu van cam duc ban thanh ve ((cua thuoc) or (nhan thuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((bach ty) OR (sach ty)) hang ca hoi. hieu van cam duc ban thanh ve ((cua thuoc) OR (nhan thuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((bach ty) OR (sach ty)) hang ca hoi. hieu van cam duc ban thanh ve ((cua thuoc) or (nhan thuc))".
• Adding a wildcard symbol may retrieve word variants: vu ((bach ty) OR (sach ty)) hang ca hoi. hieu van cam duc ban thanh ve ((cua thuoc) or (nhan thuc))*.