Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
ban thanh » ban hanh, ban hang
hoc hieu » hoc thieu, hoc hien, doc hieu
hieu cac » hieu luc, hieu va, hieu van
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu cac - hanh trinh va thong thong ((dan than) or (ban thanh)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cac - hanh trinh va thong thong ((dan than) OR (ban thanh)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cac - hanh trinh va thong thong ((dan than) or (ban thanh)) ban*.