Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, thiet hai
thong cong » trong cong, thong thong, phong chong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tong cong » trong cong, cong cong, dung cong
chinh va » chinh ta, chinh tai, hanh va
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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

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