Perhaps you should try some spelling variations:
chat khong » chat chong, chat phong, cat khong
khong cong » thong cong, khong cang, chong cong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
nang cham » trang cham, nang cao, nang phat
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 - hanh tinh chat khong cong ((nang cham) OR (tran nhat)) ran~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh tinh chat khong cong ((nang cham) or (tran nhat)) ran*.