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
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, khien canh
trinh ve » trinh he, trinh va, trinh vi
ve nhung » va nhung, tu nhung
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 nhung cong tap toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hien xanh) OR (hien khanh))) or (chieu xanh)) - canh trinh ve nhung cong tap toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((((hien xanh) OR (hien khanh))) or (chieu xanh)) - canh trinh ve nhung cong tap toan cao*.