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

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

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