Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh hang » thanh hang, hang hang, hanh han
bang cong » bang song, hang cong, dung cong
dang cong » dung cong
manh toan » thanh toan, anh tuan, tinh toan
hang cac » hang ca, hang cau, bang cac
toan tap » toan ban

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