Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
thanh tran » thanh trang, thanh toan, thanh tra
hieu manh » chieu xanh, hieu nganh, dieu hanh
lang cong » dang cong, hang cong, lang dong
bang cong » dang cong, bang song, hang cong
tran van » luan van
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap

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)) - thanh tran van ((lang cong) or (bang cong)) tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - thanh tran van ((lang cong) OR (bang cong)) tap toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - thanh tran van ((lang cong) or (bang cong)) tap toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - thanh tran van ((lang cong) or (bang cong)) tap toan cao*.