Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
tranh va » tranh van, trang va, trinh va
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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 - canh tranh va ((hang cong) OR (bang cong)) dan ((phan cau) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh tranh va ((hang cong) OR (bang cong)) dan ((phan cau) OR (phan dau))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh tranh va ((hang cong) OR (bang cong)) dan ((phan cau) or (phan dau))*".