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

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh tinh hoc khong cong ((ngang chat) or (tran nhat)) ran~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh tinh hoc khong cong ((ngang chat) OR (tran nhat)) ran*.