Perhaps you should try some spelling variations:
khong cang » hong bang, khong dung, thong cung
chieu xanh » chieu sach, chieu sang, chieu tinh
thong cong » trong cong, tong cong, thong thong
hien xanh » hien hanh, hien nhanh, hien khanh
hanh hang » thanh hang, hang hang, hanh han
hang ha » hang hoa, hang hai, hoang ha
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (chieu xanh)) - hanh hang ha ((khong cang) OR (thong cong)) tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu xanh)) - hanh hang ha ((khong cang) OR (thong cong)) tan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (chieu xanh)) - hanh hang ha ((khong cang) OR (thong cong)) tan van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu xanh)) - hanh hang ha ((khong cang) OR (thong cong)) tan van ban*.