Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
cong quang » luong quang, thong quang, duong quang
hoc thieu » toc thieu, hoc hien
cua thong » cua thuong, cua khong, cua tong
song van » hoang van, trong van, duong van
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - ((hanh tranh) OR (hanh trinh)) cua thong ((song van) or (cong quang)) khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((hanh tranh) OR (hanh trinh)) cua thong ((song van) OR (cong quang)) khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((hanh tranh) OR (hanh trinh)) cua thong ((song van) or (cong quang)) khan cap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((hanh tranh) OR (hanh trinh)) cua thong ((song van) or (cong quang)) khan cap*.