Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
chinh va » chinh ta, chinh tai, hanh va
va trong » va truong, va thong, va tuong
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 ((hieu manh) or (hieu lang)) - hanh chinh va trong cong manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu manh) OR (hieu lang)) - hanh chinh va trong cong manh toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu manh) or (hieu lang)) - hanh chinh va trong cong manh toan cau*.