Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thieu xanh » chieu xanh, thien anh, thien danh
quang suat » nang suat, quang cua, quang tuan
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh vat » trinh van, trinh luat, sinh vat
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
suat cao » suat lao, thuat cao, suat chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (hieu manh)) - hanh trinh vat ((hang cong) OR (hang nong)) quang suat cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - hanh trinh vat ((hang cong) OR (hang nong)) quang suat cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hieu manh)) - hanh trinh vat ((hang cong) OR (hang nong)) quang suat cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu manh)) - hanh trinh vat ((hang cong) OR (hang nong)) quang suat cao*.