Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
cong ngang » cong nhan, cong quang, cong nong
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh cua » tinh cua, trinh luat, trinh quan
cong lang » cong vang, cong luong, cong quang
chuan ha » chuan he, quan ha, xuan ha
chuan bi » chuan he

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh trinh cua cong ((cong ngang) OR (cong lang)) ((chuan ha) OR (chuan bi))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh trinh cua cong ((cong ngang) OR (cong lang)) ((chuan ha) or (chuan bi))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh trinh cua cong ((cong ngang) OR (cong lang)) ((chuan ha) or (chuan bi))*.