Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
hien xanh » hien hanh, chieu xanh, hien khanh
tong cong » cong cong, dung cong, dang cong
trinh va » trinh van, trinh vat, trinh ve
san quan » van quan, ban quan, dan quan
quan cau » quang cao, toan cau, quan ha

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