Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
doanh cua » doanh luan
dung cong » dung trong
manh cua » ban cua
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 chieu xanh - hanh ((manh cua) or (doanh cua)) dung cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - hanh ((manh cua) OR (doanh cua)) dung cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - hanh ((manh cua) or (doanh cua)) dung cong tap toan cao*.