Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hiem ngan » kim ngan, viem gan
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
trinh va » trinh van, trinh vat, trinh ve
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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 manh) or (hiem ngan)) - hanh trinh va ((hang cong) or (dang cong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hiem ngan)) - hanh trinh va ((hang cong) OR (dang cong)) van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hiem ngan)) - hanh trinh va ((hang cong) or (dang cong)) van toan cao*.