Perhaps you should try some spelling variations:
ban thanh » ban hang
bach thu » bach nhu, sach thu, bich thuy
thu hang » thi hang, thuc hanh, thu huong
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
cua tuc » cua duc, cua tu, cua thuoc
va hoi » xa hoi, va hoc, va hoa
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: vu bach thu hang va hoi. hieu van cam duc ((ban thanh) or (ban hanh)) vi ((cua te) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach thu hang va hoi. hieu van cam duc ((ban thanh) OR (ban hanh)) vi ((cua te) OR (cua tuc)).
• Adding a wildcard symbol may retrieve word variants: vu bach thu hang va hoi. hieu van cam duc ((ban thanh) or (ban hanh)) vi ((cua te) or (cua tuc))*.