Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
hieu xanh » chieu xanh, hieu nganh, dieu hanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
truong va » truong dai, truong cao, truong dao
cong lang » cong luong, cong quang, cong ngang
cong vang » cong quang, cong ngang, cong san
quang cao » nang cao, quang nam
va hang » van hang, va nang, va lang

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 xanh) OR (hieu manh)) - hanh truong va hang ((cong lang) or (cong vang)) quang cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu manh)) - hanh truong va hang ((cong lang) OR (cong vang)) quang cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu manh)) - hanh truong va hang ((cong lang) or (cong vang)) quang cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu manh)) - hanh truong va hang ((cong lang) or (cong vang)) quang cao*.