Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
cua trong » cua truong, cua trung, qua trong
tuong dan » huong dan, xuong dan, truong dai
tung dan » dung dan, huong dan, trung dai
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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 tranh cua trong ((tuong dan) OR (tung dan)) ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh tranh cua trong ((tuong dan) OR (tung dan)) ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - canh tranh cua trong ((tuong dan) OR (tung dan)) ((toan cau) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh cua trong ((tuong dan) OR (tung dan)) ((toan cau) or (toan ban))*.