Perhaps you should try some spelling variations:
hien khanh » hien hanh, hien nhanh, dien khanh
chieu xanh » chieu sach, chieu sang, chieu tinh
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, tong cong, thong thong
hien xanh » hien hanh, hien nhanh, khien canh
trinh ve » trinh he, trinh va, trinh vi
ve thong » he thong, va thong, ve phong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hien xanh) OR (hien khanh))) OR (chieu xanh)) - canh trinh ve thong cong tap toan cao~.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hien xanh) or (hien khanh))) or (chieu xanh)) - canh trinh ve thong cong tap toan cao*.