Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
nganh cong » nhanh chong, thanh cong
sach nhanh » cach nhanh, sach nha, sach tranh
nhanh cong » nhanh chong, thanh cong, nhanh dong
cong khi » cong thai, khong khi, co khi
so sach » so sanh, bo sach, co sach

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 nganh cong khi đong luc ) or ( so sach nhanh cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach nganh cong khi đong luc ) OR ( so sach nhanh cong khi đong luc ))*.