Perhaps you should try some spelling variations:
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
chat khong » chat chong, chat phong, cat khong
khong cong » thong cong, khong cang, chong cong
ngang chat » nang cham, ngan nhat, ngang cho
hieu lang » chieu sang, hieu quang, nhieu tang
tran nhat » toan nha, tran chau
hoc hieu » hoc thieu, hoc hien, doc hieu

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 hieu lang - nhanh tinh chat khong cong ((ngang chat) OR (tran nhat)) ran~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - nhanh tinh chat khong cong ((ngang chat) or (tran nhat)) ran*.