Perhaps you should try some spelling variations:
chieu quang » hieu quang, thieu quang, chu quang
trinh qua » trinh quan, trinh quang, trinh luat
trinh cua » tinh cua, trinh luat, trinh quan
trong dan » trong dang, trong san, trong tan
ho chieu » theo chieu, hoc thieu, doi chieu
dan toan » van toan, dan than, manh toan
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: ho chieu quang - hanh ((trinh qua) or (trinh cua)) dung trong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu quang - hanh ((trinh qua) OR (trinh cua)) dung trong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu quang - hanh ((trinh qua) or (trinh cua)) dung trong dan toan cau*.