Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh tranh » hanh trang, lanh tranh, nhanh thanh
hanh trinh » hanh chinh
hoc thieu » toc thieu, hoc hien
bang cong » dang cong, bang song, hang cong
cua bang » chua bang, cua ban, cua dang
cong tap » cuong tap, cong tac, cong tan
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 - ((((hanh tranh) or (hanh trinh))) or (canh tranh)) cua bang cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((((hanh tranh) OR (hanh trinh))) OR (canh tranh)) cua bang cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((((hanh tranh) or (hanh trinh))) or (canh tranh)) cua bang cong tap toan cao*.