Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu sang » chieu sach, chieu xanh, hieu lang
cong quang » luong quang, thong quang, duong quang
quang phan » quang chan, quang phat, quang thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
cua trong » cua truong, qua trong, ca trong
cua trung » cua truong, xuan trung, cua nhung
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu manh) or (chieu sang)) - hanh trinh ((cua trong) OR (cua trung)) cong quang phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (chieu sang)) - hanh trinh ((cua trong) OR (cua trung)) cong quang phan dau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (chieu sang)) - hanh trinh ((cua trong) OR (cua trung)) cong quang phan dau*".