Perhaps you should try some spelling variations:
trung tuong » trung uong, trong tuong, trung trong
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
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 trung tuong 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 trung tuong dan ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh cua trung tuong dan ((toan cau) or (toan ban))*.