Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat
chi sang » chi lang, chieu sang, chi chang
ban cong » bang cong, van cong, phan cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sang - hanh ((trinh quan) or (trinh han)) ban cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - hanh ((trinh quan) OR (trinh han)) ban cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: doi chi sang - hanh ((trinh quan) or (trinh han)) ban cong dan toan cao*.