Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trang » thanh trung, canh tranh, hanh trinh
thong cong » trong cong, tong cong, thong thong
hieu manh » hieu nganh, dieu hanh, hien hanh
cua thong » cua thuong, cua khong, cua tong
cong vang » cong lang, cong quang, cong ngang
vang than » sang than, van than, cang thang
anh tang » anh bang, anh dang, anh nang
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) OR (chieu xanh)) - ((anh tang) or (hanh trang)) cua thong cong vang than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu xanh)) - ((anh tang) OR (hanh trang)) cua thong cong vang than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (chieu xanh)) - ((anh tang) or (hanh trang)) cua thong cong vang than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (chieu xanh)) - ((anh tang) or (hanh trang)) cua thong cong vang than cap*.