Perhaps you should try some spelling variations:
quang thuoc » dung thuoc, dang thuoc, quang hoc
thuoc trong » thuc trong, hoc trong, thuat trong
hanh trang » thanh trung, canh tranh, hanh trinh
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
hanh tang » anh tang, hanh mang, hanh tung
trong dan » trong dang, trong san, trong tan
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: doi chieu sang - ((hanh tang) or (hanh trang)) quang thuoc trong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((hanh tang) OR (hanh trang)) quang thuoc trong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((hanh tang) or (hanh trang)) quang thuoc trong dan toan cau*.