Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu sang » chieu sach, chieu xanh, hieu lang
hanh dam » thanh dam, hanh lam, hanh nam
ban cong » bang cong, van cong, phan cong
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh
dam van » dao van, nam van, pham van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu quang) or (chieu sang)) - hanh dam van ban cong ((dan toan) or (van toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (chieu sang)) - hanh dam van ban cong ((dan toan) OR (van toan)) tap.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (chieu sang)) - hanh dam van ban cong ((dan toan) or (van toan)) tap*.