Perhaps you should try some spelling variations:
sang ngang » cong ngang, sang nhung, dang nganh
sach ngan » sach ngon, sach nha, sach han
ngang ly » nganh y, hang ly, bang ly
so sach » so sanh, bo sach, co sach
ngan ky » nganh ky, nhan ky, ngan hay
so sang » so sanh, so dang, so lang
ky khi » ky thi, ly khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach ngan ky khi đong luc ) or ( so sang ngang ly chi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach ngan ky khi đong luc ) OR ( so sang ngang ly chi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( so sach ngan ky khi đong luc ) or ( so sang ngang ly chi đong luc ))*.