Perhaps you should try some spelling variations:
chieu quang » hieu quang, thieu quang, chu quang
thanh trung » thanh tung
ho chieu » theo chieu, hoc thieu, doi chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
hoc lap » hoc lam, doc lap, hoc phap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu quang - thanh trung ((hoc lap) or (hoc tap)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu quang - thanh trung ((hoc lap) OR (hoc tap)) cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu quang - thanh trung ((hoc lap) or (hoc tap)) cong tac toan cau*.