Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hien xanh » hien hanh, chieu xanh, hien khanh
chinh cua » chinh sua, hinh cua, chinh luan
cong vang » cong lang, cong quang, cong ngang
chinh ca » chinh ta, chinh va, chinh tai
vang tan » van tan, tang tan, vang tao
tan cau » toan cau, van cau, tan ca

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 (hien nhanh)) - hanh ((chinh cua) or (chinh ca)) trong cong vang tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - hanh ((chinh cua) OR (chinh ca)) trong cong vang tan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien nhanh)) - hanh ((chinh cua) or (chinh ca)) trong cong vang tan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien nhanh)) - hanh ((chinh cua) or (chinh ca)) trong cong vang tan cau*.