Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
cong thanh » dong thanh, cong trinh, cong tan
nang dua » nang suat, nang quan, nang luc
cong anh » cong danh, dong anh, hong anh
nang du » nang tu, nang luc, nang doc

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu xanh - anh ((nang dua) OR (nang du)) cong ((cong anh) or (cong thanh)) tuyen tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - anh ((nang dua) OR (nang du)) cong ((cong anh) OR (cong thanh)) tuyen tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - anh ((nang dua) OR (nang du)) cong ((cong anh) or (cong thanh)) tuyen tap".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - anh ((nang dua) OR (nang du)) cong ((cong anh) or (cong thanh)) tuyen tap*.