Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
trinh nhat » trinh chat, trinh nha, trinh nhap
trong mach » trong cac, trong minh, trong anh
minh nhat » minh nhan, minh chau, minh pham
minh khai » minh khue, minh chau, minh chi
mach toan » manh toan, hach toan, mach tuan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu quang - hanh ((((minh nhat) OR (minh khai))) or (trinh nhat)) dung trong mach toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu quang - hanh ((((minh nhat) OR (minh khai))) OR (trinh nhat)) dung trong mach toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu quang - hanh ((((minh nhat) OR (minh khai))) or (trinh nhat)) dung trong mach toan ban".
• Adding a wildcard symbol may retrieve word variants: toc thieu quang - hanh ((((minh nhat) OR (minh khai))) or (trinh nhat)) dung trong mach toan ban*.