Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
cua trung » cua truong, xuan trung, cua nhung
tuong dan » huong dan, tung dan, xuong dan
dung dan » dung dat, tung dan, huong dan
dung san » dong san, dung sai, dung luan
toan cau » 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 tranh cua trung ((tuong dan) or (((dung dan) OR (dung san)))) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh tranh cua trung ((tuong dan) OR (((dung dan) OR (dung san)))) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - canh tranh cua trung ((tuong dan) or (((dung dan) OR (dung san)))) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh cua trung ((tuong dan) or (((dung dan) OR (dung san)))) toan cau*.