Perhaps you should try some spelling variations:
khong trong » khoang trong, thong trong, phong trong
hanh tranh » canh tranh, hanh trinh, hanh trang
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
cua khong » hua khong, cua phuong, cua thuong
manh toan » thanh toan, anh tuan, tinh toan
van tan » van tuan, van ban, van tai

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 - hanh tranh cua khong trong ((van tan) or (manh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh tranh cua khong trong ((van tan) OR (manh toan)) cau*.