Perhaps you should try some spelling variations:
khong phan » thong phan, khong phai, khong phap
chieu sang » chieu sach, chieu xanh, hieu lang
hoc chieu » hoc thieu, ho chieu, hoc hien
doanh cua » doanh luan
phan tinh » phan tich, phan dinh, phan kinh
manh cua » ban cua
toan cau » 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 sang - hanh ((manh cua) or (doanh cua)) khong phan tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - hanh ((manh cua) OR (doanh cua)) khong phan tinh toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - hanh ((manh cua) or (doanh cua)) khong phan tinh toan cau*.