Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien hanh » dieu hanh
hang cua » mang cua, huong cua, thong cua
san toan » van toan, dan toan, manh toan
dan than » dan chan, ban than, van than
ho hien » hoc hien, hoa hien, ho mien
hang ca » hang va, nang cao, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hien hanh - nang ((hang cua) OR (hang ca)) nhung cong ((san toan) or (dan than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hien hanh - nang ((hang cua) OR (hang ca)) nhung cong ((san toan) OR (dan than)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hien hanh - nang ((hang cua) OR (hang ca)) nhung cong ((san toan) or (dan than)) tap".
• Adding a wildcard symbol may retrieve word variants: ho hien hanh - nang ((hang cua) OR (hang ca)) nhung cong ((san toan) or (dan than)) tap*.