Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
cong huong » cong thuong, cong luong, cong hung
hieu manh » chieu xanh, dieu hanh, hien hanh
tnhan tai » toan tai, nhan tao, han tai
hanh san » thanh san, khach san, thanh son
nhan tai » hang tai, van tai, toan tai
san cua » sang cua, ban cua, dan cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu manh) OR (hieu nganh)) - hanh san cua cong huong dan ((tnhan tai) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (hieu nganh)) - hanh san cua cong huong dan ((tnhan tai) OR (nhan tai)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) OR (hieu nganh)) - hanh san cua cong huong dan ((tnhan tai) or (nhan tai))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) OR (hieu nganh)) - hanh san cua cong huong dan ((tnhan tai) or (nhan tai))*.