Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
thong dung » thong cong, thong thuong
dung thanh » duong thanh, dong thanh, dang thanh
hieu manh » chieu xanh, dieu hanh, hien hanh
canh hang » tranh hang, cang thang, danh thang
va thong » va thuong, va phuong, he thong
hoa cau » hoa cac, hoa dau, hoa mau
hoa dam » hoa dan, hoa am, hoa dai

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 (hieu nganh)) - canh hang va thong dung thanh ((hoa cau) or (hoa dam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - canh hang va thong dung thanh ((hoa cau) OR (hoa dam)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (hieu nganh)) - canh hang va thong dung thanh ((hoa cau) or (hoa dam))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (hieu nganh)) - canh hang va thong dung thanh ((hoa cau) or (hoa dam))*.