Perhaps you should try some spelling variations:
phong chong » thong thong
thanh han » thanh phan, thanh nhan, thanh hang
chong ban » hong ban, phong ban, chong buon
va phong » van phong, va phuong, va thong
ban than » ban thanh, van thanh, ban hang
than tap » toan tap, han tap, phan tap
han va » hang va, hanh va, nhan va

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

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