Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, chong cong
hoac khong » hoa khong, hoc khong, hay khong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh hoac » tinh hoc, tinh hoa, trinh hoan
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.

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