Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
hanh hang » thanh hang, hang hang, hanh han
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
than cao » toan cao, thai cao, than cap
khan cap » khan ap, than cap, khoan cam

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 - hanh hang va ((bang cong) OR (hang cong)) dan ((than cao) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh hang va ((bang cong) OR (hang cong)) dan ((than cao) OR (khan cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh hang va ((bang cong) OR (hang cong)) dan ((than cao) or (khan cap))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh hang va ((bang cong) OR (hang cong)) dan ((than cao) or (khan cap))*.