Perhaps you should try some spelling variations:
canh trinh » canh tranh, canh tinh, anh trinh
hanh trinh » canh tranh, hanh chinh
quan thong » quang thong, quan trong, xuan thong
hien xanh » hien hanh, hien nhanh, chieu xanh
thong tan » thong than, thong tran, thong tin
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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